'We used to think of light and darkness as harmless'
Previous research has suggested women need more sleep as their brains are 'more complex' than men's
Both women had been looking at their phones with one eye, while the other was covered by a pillow
You don't have to add three leisurely hours to your morning routine to be happy or productive
A good night's sleep has the power to increase productivity, happiness, smarter decision-making, and unlock bigger ideas.
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'
'It doesn't take that many days of not getting enough sleep before you're functionally drunk,' researcher warns
'Your body is not allowing you to rejuvenate at all so it's like being awake for the last six months of your life'
There's no one morning routine that works for everyone.
Although people recognise the importance of sleep, they still fail to make enough time for it each night
Getting a good night's rest is about more than just going to bed at an appropriate time.
Feeling excessively sleepy is also associated with metabolic syndrome
It comes down to a battle in your brain
Women most likely to be at risk from heart problems even if they sleep 'too much or too little'
Eyelid droopiness and subtle frowning in the face can alter perceived intelligence, according to a recent study
Lack of sleep doesn’t just make people tired and irritable - it can also cause a temptation for unhealthy snacks similar to the “marijuana munchies”.