Sleeping , although impressed trivial, is a very important activity to restore the physical and psychological condition. Therefore, sleep should be sufficient, both in quality and quantity.
In terms of quantity, which is considered sufficiently long sleep differently for each age group. For a baby needs 12 to 15 hours, school children do not need 21 to 14 hours, school-age children need 10 hours 11 hours, while adults need 7 to 9 hours.
In addition, some circumstances may also affect the amount of sleep needs. Pregnant women need a longer time to sleep. For the elderly often experience changes in sleep patterns, ie less soundly and wake up easily. This causes daytime sleepiness arises. In addition, if sleep is interrupted, the old requirement also increases.
According to studies, people who lack sleep for several nights, not able to do complex mental tasks than those who get enough sleep, which is about seven hours.
sources:
http://www.mayoclinic.com/health/how-many-hours-of-sleep-are-enough/AN01487/rss=1
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