The impact goes far beyond grogginess and irritability. In many cases, sleep loss can give certain diseases the upper hand.
Irregular sleep patterns or lack of shut-eye could be behind those stubborn pounds you've mysteriously piled on – as lack
Drugs that affect the brain's "biological clock" may help combat obesity, high cholesterol and diabetes, early research suggests
New research has challenged the popular belief that early risers work better in the day and night owls work better at night