Sleep right
Getting up after a poor night's sleep can be tough. You may feel tired and start falling asleep in the day. You may also find it hard to concentrate on things or make decisions - and you might begin to feel emotional or depressed.
Longer-term sleep deprivation can eventually lead to hallucinations and delusions. Luckily, most of us don't reach that stage.
No one knows exactly why we sleep, but scientists think it might give our brains time to rest.
Regular exercise won't only help you live longer by reducing your risk of heart disease, high blood pressure and stroke - it will help you combat tiredness as well. In the long run it will give you more energy in the day and help you get to sleep at night.
You should aim to do 30 minutes of moderate exercise, five times a week. (But avoid exercising within four hours of going to bed - this will keep you awake.)
Publication date: September 2008
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