Who gets to sleep, and for how long, is a complex mix of biology, psychology and society. Here’s what we know so far.

Women may sleep slightly more on average, just as they are slightly shorter on average. But there is no one-size-fits-all ...

We receive messages about the importance of sleep beginning in childhood. You may remember mandatory naps enforced by adults ...

Despite sleeping slightly longer, women often report poorer sleep quality compared to men, influenced by hormonal shifts during puberty, pregnancy, and menopause. Health conditions like iron ...

How much sleep do teens need in the summer? Should parents wake up their teens at a semi-decent hour of the morning, or let them sleep? He ...

Experts explain why women may need more rest than men Biological factors such as hormonal fluctuations, can make sleep disturbances more common and increase the risk of developing sleep disorders ...

This is a simple guideline that's easy to remember and usually easy to achieve. If you weigh 150 pounds, aim to drink 75 ounces of water each day. This is the only rule of thumb that accounts for ...

Sleep may not just be rest for the mind—it may be essential maintenance for the body's power supply. A new study by ...

In the spring and fall, you get a more normal 12 hours of daylight. During those periods, I can tell my body is latching onto a regular Circadian rhythm. But even then, because of where we are ...

How much sleep is enough? Like many sleep enthusiasts, and even sleep doctors, we've spent a lot of time mulling over the question of how much sleep we really need.