Who learns faster: larks or owls?
Reducing sleep without alarm clock How to improve evening alertness Sleep length depends on the circadian phase Worn-out syndrome is not likely in good sleepers Which component of sleep is best correlated with the fresh feeling in the morning If you wake up in the middle of the night, getting up to work may be a good idea Free running sleep does not imply abnormal sleeping habits Beware of false claims on the net!
