Is Eight Hours of Sleep Really Necessary?

Many people think every adult must sleep for eight hours. But sleep scientists say the answer is not the same for everyone. Age, health and daily life can change how much rest a person needs.

Some studies found that people in traditional communities sleep for about six to seven hours on average. This does not prove that six hours is enough for all adults. Those communities may have different stress, work and health conditions.

Experts say the eight-hour rule is too simple. For many adults, seven to nine hours is a useful range. Notice how you feel in the day: Are you alert and able to work? Sleep quality and a regular pattern matter too.