People who continuously get less sleep than their body needs have built up what experts call a sleep debt. This is when the lack of sleep accumulates over time and it takes its toll on intellectual and motor functions. If you can not get the sleep you need every night, it is important to try and make it up as soon as possible. Some people try to do this on the weekends or by taking naps. But, experts say this often only makes a small dent in a large sleep dept and the brain still feels the need to sleep through out the day.
Sleep needs vary from person to person and by age.
Preschoolers - 11 to 12 hours. Half of preschoolers also nap during the day. Having a good night s sleep can only improve one s memory and learning. Not getting enough sleep can be dangerous to your mental and physical health. For some people, getting a good night s sleep is something they want to do but can't.