How much sleep do we need? (practice English)

The amount of sleep each person needs depends on few factors, including age. Infant generally require about 16 hours a day. For most adults, seven to eight hours a night appears to be the ideal amount of sleep, although a little people may need a as amount as five hours' sleep or as amount as ten hours's sleep each day. Getting too sichmuch sleep creates a sleep debt, and eventually, your body will demand that the debt be repaid.

A large number of people over 65 have frequent sleeping problems, such as insomnia, and deep sleep stages in many elderly people often become very short or stop completely. Microsleeps, or very brief episodes of sleep in an otherwise awake person, are another mark of sleep deprivation. In many cases, people are not aware that they are experiencing microsleeps. The widespread practice of burning the candle at both ends in western industrialized societies has created so many sleep deprivation that what sleepiness is now almost the norm.