Tonight, somewhere in America, a young person, let's say a young man, will struggle to fall to sleep, wrestling alone with a secret he's held as long as he can remember.

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Lulled by the silence of the carriage and the prospect of alpine rail travel, I fall into a deep, childlike sleep.

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Blue light suppresses production of a brain chemical called melatonin, which helps us fall sleep.

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"Exercisers fall asleep faster, suffer fewer middle-of-the-night wake-ups and have a reduced risk of sleep disorders, " says study co-author Brad Cardinal, co-director of the sport and exercise psychology program at Oregon State University.

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