Want to get ahead? Sleep in - The Globe and Mail: "The study measured the part of the brain that is home to the circadian master clock that operates according to a day-night cycle. Sleep pressure dampens the circadian signal, and activity in this area decreases the longer the person is awake. The night owls were more resistant to sleep pressure.
Genetics dictate whether someone is a morning person, Prof. Peigneux said, adding that most people are “neutral.” But 15 per cent of the population is an “extreme” early morning or late riser; and another 15 per cent are “moderately evening or morning types.”"
