Differences between males and females abound, of course — but some are found in the oddest places.
New research has found that women tend to have shorter, earlier sleep cycles then men. This makes women typically go to bed earlier and get up earlier in the morning. It could also cause women's higher rates of insomnia and seasonal depression.
"This has implications for how easily they can fall asleep and how well they can stay asleep," said study researcher Jeanne Duffy of Harvard Medical School. "It could alter and contribute to differences between individuals as to when it's easy to go to bed or wake up."
The researchers found that, on average, women's 24-hour sleep-wake cycle (called the circadian rhythm) is about six minutes shorter than men, but in the reality of sleeping and waking, this equates waking up about 30 minutes earlier.