A group of doctors want lessons on the importance of sleep - and how to sleep well - to be taught in schools.
They reckon having the right amount of sleep is just as important as eating healthily and exercising regularly.
What do you think about sleep lessons - are they a good idea?
And how much sleep do you get get? Do you get enough? Or perhaps you think you get too much? How much sleep you think you NEED?
Sorry- but this comments page is now closed. But have your say on other subjects on the main Chat index.
"I think it's not a great idea. All we have to do is close our eyes! But maybe lessons on why sleep is important would be good."
Joe, 11, Coventry, England
"Sounds cool but how do you teach sleep? I already have them - they're just called Maths. Sleep is important for everyone but a lot of people don't get enough sleep so if they teach people to sleep then it could be a good idea."
Sarah-Anne, 12, Birmingham, England
"I think they would be a bad idea because you won't be able to sleep if someone is telling you to sleep!"
Aoife, 11, Cork, Ireland
"I don't know, because telling people how to sleep would be boring because everyone knows how to sleep. But children would think sleeping in lesson would be a good thing."
Nyemh, 11, Lancashire, England
"I think sleeping lessons would be a great idea. It will be a subject instead of the rubbish English, Maths and Science."
Laura, 13, England
"I think it's a great idea."
Jazzmin, 10, London, England
"I don't think sleeping lessons are a good idea because it is harder to go to sleep if they are telling us to go to sleep."
Ceri, 8, Scotland
"I think it is a good idea but different people have a different way of sleeping which they find comfortable."
Areeja, 13, London, England
"I don't think it's a good idea because most people can sleep anyway and it would just waste more learning time."
Nicole, 12, Scotland
"I don't think sleeping lessons are a good idea because if we do go to sleep then we will be really tired when we wake up, so the next lesson we do we won't pay attention."
Grace, 10, Swindon, England
"Yes, because I don't find getting to sleep easy!!!"
Jasmine, 11, Suffolk, England
"It only works if you didn't have a good night's sleep!"
Matthew, 10, Hampshire, England
"I think that this would be a good idea, especially on a Monday morning. I also think that children [aged] between 9 and 12 should get at least get 9 hours of sleep. I normally go to sleep at 9pm."
Ayesha, 11, Leicester, England
"It sounds really weird if you think about it and generally it does waste your time. Sleeping well is very important for your wellbeing, but it can be taught very quickly and you shouldn't have to go into much detail."
Maria, 13, West Midlands, England
"Personally, I believe that sleeping lessons are really important even if they take you out of class for 20 minutes. Bit by bit it will really make a difference. You will sleep better so that you CAN concentrate on the important stuff, like maths and English, all for 20 minutes each day! Doesn't hurt to try."
Amy, 11, Northamptonshire, England
"Our timetable is already full. I don't know how we would fit it in!"
Ka, 9, Buckinghamshire, England
"That would be plain boring. They're just teaching you stuff you already know."
Ellie, 11, Kent, England
"My favourite hobby is sleeping! LOL! Actually, I think sleeping lessons are great because many people find it hard to sleep and lose a lot of energy."
Jennifer, 13, London, England
"I think that there should be sleeping lessons because hard work is tiring."
Amelia, 10, Dorset, England
"I think sleeping lessons are cool because we'll be able to sleep during the lesson and not get in trouble because it's a sleeping lesson."
Kristina, 11, Wales
"I think sleeping is important but doing extra exercises and banning gadgets is not good. Boring lessons will make a child a bore so make the lesson more active."
Sabhia, 11, Birmingham, England
"I think you need to have a bit of snoozing, but 25 minutes is enough in the daytime."
Lauren, 8, Wales
"I think sleeping lessons are a good idea because the children get rest."
Jack, 11, London, England
"I think sleeping lessons are a good idea because sometimes I find it hard to get to sleep and stay up all night!"
Gemma, 9, West Sussex, England
"I am ALWAYS tired! Even though I go to bed at 7.30pm! Sleep lessons however sound a bit pointless."
Kara, 13, Scotland
"I think it's a fab idea because then we can get our brains functioning better when we wake up. And I think people would enjoy it."
Gemma, 13, London, England
"I think we should have sleeping lessons because we would not be so tired after school and it will make us think harder. I wish I could have them."
Anya, 10, Yorkshire, England
"I think we should have sleeping lessons in high school because when kids go to high school they think they can go to bed late."
Mary, 12, Newcastle, England
"Sleeping lessons would be awesome because when we have to get up early for school we can just sleep again at school! It will be so AWESOME! For important tests like our GCSEs and Sats our brain will be more focused because it helps our brain to grow."
CVD, 13, Wycombe, England
"I find it really hard to sleep and I am always tired. It would be a great idea but how would they do it?"
Georgia, 13, Cardiff, Wales
"What a waste of valuable education time!"
Sophie, 12, Kent, England
"Sounds fun but what would they teach us?"
Yasmine, 9, London, England
"I think it's a good idea because many kids don't know how important it is for you to sleep."
Abigail, 11, Nottinghamshire, England
"How do you teach sleep? Is it called maths? Only joking. They might be a good idea as I never get much sleep."
Chloe, 11, Birmingham, England
"Great idea. Hope these start at my school!"
Channelle, 10, UK
"Great idea. I'd love it. Even though I know how to get to sleep!"
Holly, 10, Cheshire, England
"I think it will be great because it will encourage people to get up earlier and go to bed earlier too and I think we should go to school from about 11am until 2pm."
Stephanie, 13, Sunderland, England
"Sure, it's a fab idea! I can never get to sleep, so lessons might be kind of helpful."
Nicole, 12, Surrey, England
"I think it's a bad idea, because you would be learning nothing and not becoming a brain."
Louise, 11, Staffordshire, England
"It is up to the children and the parents of the children about how much sleep they get."
Natalie, 13, Suffolk, England
"I think they are a good idea, because I actually have trouble sleeping and it would be good for me to have lessons."
Jessie, 12, Germany
"I think sleeping lessons are a good idea because people in my class go to bed at 9pm and they are always the mean ones and they need some rest otherwise they are always grumpy and disrupt the class."
Joshua, 9, Kent, England
"I think we need sleep in school because of how long school goes on, and when we get home we have homework so we get hardly any sleep, plus we have to wake up early."
Frazer, 13, Leicester, England
"I think it is a rubbish idea. Kids go to school to learn not to sleep. What's the point of going to school if you just sleep? Your parents should be in charge of how much you sleep, not schools. Honestly."
Charlotte, 10, Middlesex, England
"I think sleeping lessons would be a good idea as some children have a lack of sleep so it would do good for them to learn how to sleep."
Shania, 11, Lincolnshire, England
"I don't think it's a good idea. Sleep is not the MOST important thing in the world."
Sophie, 10, Northern Ireland
"I would like to know how to get to sleep faster. I am tired at school and until the start of lunch I am yawning like mad and not doing as well as I know I could."
Rhona, 13, Strathaven, Scotland
"I think sleeping lessons are a good idea because some people struggle to get to sleep. I think it will help them a lot."
Daniel, 9, Bolton, England
"No, I think it's a ridiculous idea. We already have an hour and 20 minutes off our time at school for break and lunch. We don't need another half an hour or an hour dedicated to learning how to sleep! We need to learn!"
Jennifer, 12, London, England
"I think sleeping ideas are a great idea because I don't think I get enough sleep, so I'm a bit moody at school."
Laura, 9, Bolton, England
"I think that sleeping lessons are a good idea because lots of children stay up too late and don't get as good a sleep as they could get."
Ella, 10, St. Albans, England
"Sleeping lessons would be excellent. You would get to sleep instead of doing numeracy or English. WICKED."
Rebekah, 11, Barnstaple, England
"I sometimes find it hard to get to sleep, but if I read my book then I am able to go to sleep."
Hinna, 12, Woking, England
"We already have lessons like this. Every Friday afternoon we have enrichment classes. They get us to think about what helps our brain and ways that will help us concentrate in class."
Paul, 11, Newcastle, England
"I think that it's absolutely ridiculous. It just means that you miss time in school when you could be learning something new."
Marina, 13, London, England
"I think it is a good idea because a lot of people are tired and find it hard to concentrate."
Joshua, 12, Lancashire, England
"You wouldn't actually go to sleep!! You would be taught the importance of it. We already learn about nutrition and exercise in science so why not add sleep as well?"
James, 13, Surrey, England
"I do not think it is a good idea because we would already know how to sleep. Why are they bothering to have sleeping lessons? It is just a waste of time. We are at school to learn hard things not easy things."
Emily, 10, London, England
"Sounds good. I'm an insomniac so believe me, I would need something like that."
Niamh, 13, Ireland
"I think it's a weird idea because it sounds like hypnotising someone to sleep. Maths gets me to sleep anyway."
Chloe, 11, Glasgow, Scotland
"Is this an excuse for teachers to sleep?"
Liam, 12, London, England
"I think sleeping lessons are a great idea. I have to get up at half six, if I could learn how to get more sleep I'd be way less tired!"
Georgianna, 12, Ireland
"Yes, some people find sleeping very difficult so I think this will help children and possibly adults."
Cerys, 10, Market Harborough, England
"I think sleep lessons for parents would be a better idea. If parents are more clued up, then the kids will obviously be too."
Lizzie, 13, England
"No because I would probably go to sleep in the lessons!"
Channelle, 8, London, England
"I think sleeping lessons are a very good idea because you can find out how to help yourself get to sleep if you are having trouble."
Hannah, 10, London, England
"I think it is because most of us want to stay up late or we just can't sleep. I get that a lot so I'm always tired at school. Once or twice I've fallen asleep at school!!"
Charlotte, 13, Derbyshire, England
"No point because I already have a sleeping hour- it is called Maths!"
Farah, 10, London, England
"Weird idea, nobody can tell us HOW to sleep, or do they mean how to GET to sleep. But maybe not sleep lessons but relaxation classes!"
Sadie, 13, Bristol, England
"I think this is really stupid!! You have to be stupid if you don't know how to sleep! You just close your eyes, yeah, cause that's so hard!!!!"
Lottie, 12, Manchester, England
"I do not think it is a good idea to have a sleep lessons because you should know how to sleep!"
Ali, 12, England
"Sounds great to me, but only if the school day wouldn't have to be longer!"
Hannah, 13, Shropshire, England
"Sleep is just as big a health concern as eating is, so lessons on how to sleep correctly would help everyone!"
Adam, 13, Cambridge, England
"I think we should get sleeping lessons because I find it hard to get to sleep."
Mia, 12, Halifax, England
"I feel much more clever after a good sleep. So bring on sleeping lessons I say!!"
Danny, 12, Oxford, England
"I think sleeping lessons are a great idea because kids like me find it really hard to get to sleep and so do lots of adults."
Megan, 9, Wiltshire, England
"I strongly think this should not happen in secondary schools as there they take learning more seriously and it will also affect school hours - as you have to have a certain number of hours at school."
Alina, 12, England
"Yes, I do think that it is good to sleep in class. But not all the time, maybe children could have a rest during breaks."
Evie, 10, Milton Keynes, England
"I think it would be fun to have sleeping lessons, as you wouldn't get told off for sleeping in class!"
Jessica, 11, Birmingham, England
"I don't think it's a good idea because school is for learning and sleeping lessons at school aren't really appropriate."
Dionis, 10, London, England
"I think sleeping lessons would be a good thing because I know lots of people who have trouble sleeping."
Tiffany, 14, Plymouth, England
"I think sleeping lessons are a very good idea. A school day is hectic and can often make you feel very run down, and if you don't sleep then you will get very tired. With sleeping lessons, you can learn how to relax after a busy day and get a good night sleep."
Minnie, 13, London, England
"Yes, we should get these lessons because I find it very hard to sleep no matter the time. This has affected my concentration at a very bad time."
Colm, 14, Dungannon, Northern Ireland
"I think it'll be really good to have sleeping lessons because my friend sleeps at 4am on weekends!"
Daphne, 11, Kuala Lumpur, Malaysia
"It all sounds a bit silly, but I'm asking the same question everyone else is, how do you teach sleep?"
Jodie, 10, Frodsham, England
"That sounds OK, but where would they fit it in? I bet we'd have to do it after school, because they wouldn't want to change how much school time is spent on normal lessons."
Gemma, 13, Nuneaton, England
"I already sleep in History. LOL! But I think it would be quite funny to have sleeping lessons."
LuLu, 12, London, UK
"Good idea! About time the government thought of something like this."
Siobhan, 12, Bath, England
"I think this is bad because people have different ways in which to go to sleep."
Emily, 12, Newcastle, England
"Instead of teaching sleep in schools we should shorten the school hours, start at 10am, finish at 3pm."
Rosie, 13, Upminster, England
"Some people don't understand that it won't be a lesson you are going to sleep in - it will just be part of your health class. It will be part of your education so you won't miss out in maths and English. Why are you people so bothered about missing them. DONT WORRY you will still have time for the boring stuff like maths and English."
Lizzie, 12, Glasgow, Scotland
"I don't need them, I never get much sleep at night so I use the boring lessons at school!"
Katie, 12, UK
"I think it's a good idea because some people have real trouble sleeping. But teaching sleeping? How on Earth are doctors going do that?"
Lizzie, 12, Cambridge, England
"I think it would be good, even better if we could go to sleep!"
Thomas, 11, Heywood England
"I already have sleep lessons. They're called maths... LOL! I would like them though."
Matthew, 13, Swindon, England
"I don't think this is a good idea because if we have those lessons, we won't have enough time to have English and maths and everything else. It is our parent's job to teach us to sleep."
Connor, 10, Braunton, England
"I think sleeping lesson are a good idea because she people find it hard to sleep at night."
Shyeem, 12, Hackney, England
"I think sleeping lessons are a good idea because it is very important to get a good night's sleep as it affects every aspect of everyday life."
Scarlet, 7, Cwmbran, Wales
"Sounds great... do it in boring lessons like PHSEE and Maths, that'll help us to get to sleep!"
Alex, 11, Muscat, Oman
"No it will not help cos at my school we already have sleeping lessons and it doesn't help."
Mattthew, 11, New Delhi India
"How would they teach people to sleep?! But anyway, I would need sleep lessons! I only get like two hours of sleep each night!"
Jake, 12, UK
I don't think this a good idea because you could lose some of your education time and you won't learn enough at school."
Riannah, 10, Dartford England
"Brilliant idea... I would love it. Though I know how to sleep."
Cameron, 12, Friockheim, Scotland
"I think it might be a good idea because kids will understand why their parents tell them to go to sleep earlier. But it sounds really silly and not necessary."
Lucy, 12, London, England
"No way! It's not our fault some people can't get enough sleep. We need to learn so we have a good future. I get enough sleep (about eight hours each night) and I think that's enough."
Nahida, 11, London England
"I would love it but we already have 1hr 15 mins of our time at school chipped off with playtime so no it would damage our education. And if I had sleeping lessons I won't get to sleep at night!"
Matthew, 10, Trowbridge, UK
"It sounds cool - but how do you teach sleep?"
Ella, 13, UK