Here's what couples look like when they sleep

Paul Maria Schneggenburger has always been fascinated with sleep."It’s an unconscious state of mind where scientists still haven’t really figured out yet what’s going on," he says.

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A good night's sleep: How to get it

If you find it hard to feel fully rested in the morning then try following these 12 tips from Arianna Hufington, author of 'The Sleep Revolution'