The next time you are tempted to hit the snooze button on your alarm clock, hold fire.
Research suggests that early risers are slimmer, happier and healthier than those who get up later in the day.
Worst off are night owls, with late nights seemingly taking their toll on health and happiness.
Roehampton University researchers quizzed almost 1,100 men and women about their health and sleeping habits.
Some 13 per cent of those questioned were larks, getting up before 7am during the week and seeing no need for a lie-in at the weekend.
Night owls, who fall out of bed just before 9am Monday to Friday and sleep in on Saturdays and Sundays, accounted for another 6 per cent.
The remaining 81 per cent fell somewhere in between.