Do students need naps or will a good night's sleep do the trick?
The latest science shows that your phone might be stopping you from getting enough sleep, raising the risk of accidents, heart ailments and diabetes.
An estimated average of 15% of staff are absent on any given day - and only one in three people who do not go to work are actually physically ill.
For decades, scientists have been trying to figure out how we sleep. They have their theories, but the bottom line is that you need eight hours a day.
One in 10 Britons regularly take a drug to help them to sleep. But is it time to stop popping zopiclone, temazepam and other tablets?