No one knows for sure,but most scientists believe that during sleep the brain organises,processes and stores information,and produces memories.It also gives body time to rest.If you don't get enough sleep,you become irritable and find it hard to concentrate
How much sleep ?
Age Hours a day
Newborns. 10.5-18
3-11 months. 9-12
1-3 years. 12-14
3-5 years. 11-13
5-12 years. 10-11
11-17 years. 8.5-9.25
Adults. 7-9
How much sleep ?
Age Hours a day
Newborns. 10.5-18
3-11 months. 9-12
1-3 years. 12-14
3-5 years. 11-13
5-12 years. 10-11
11-17 years. 8.5-9.25
Adults. 7-9
Sleep disorders