When travelling, people are more likely to suffer from insomnia due to the "first night" and "on call" effects, research suggests.
The first occurs when trying to sleep in a new or unfamiliar environment and the second is caused by the nagging worry that some disruption might wake you.
It is all becoming so overwhelming for the modern traveller that some hotels have started to offer specialist packages to give their guests a better night's sleep as Rajan Datar reports from The Milestone Hotel in London.
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