The brain uses plenty of energy during sleep, so sleep is not analogous to resting a muscle and allowing energy stores to recharge. We run through the stages one after another. We only use the information we collect for purposes consistent with this policy.
Research has shown that when animals learn a new task, their neurons seem to strengthen the synaptic connections involved in learning that task during the next sleep cycleaccording to the Sleep Medicine Reviews paper. Some of our websites contain links to other sites.
The hope is that by better understanding why we sleep, we will learn to respect sleep's functions more and enjoy the health benefits it affords. But many older people only need about 7 or 8 hours of sleep each night. Industrial accidents are more common, and drowsy driving car accident rates are higher.
Limit the difference to no more than about an hour. Sign Up for e-mail newsletters Get breaking science news on monster snakes and dinosaurs, aliens, spooky particles and more! During sleep, the body has a chance to clear adenosine from the system, and, as a result, we feel more alert when we wake.
Even adults experience a surge in growth hormone during their first deep sleep period of the night. What do we know about sleep?