Amount, number, few, little, many or much?

Điền vào chỗ trống amount, number, few, little, many hoặc much.

How much sleep do we need?

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

A large of people over 65 have frequent sleeping problems, such as insomnia, and deep sleep stages in 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 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 sleep deprivation that what is really abnormal sleepiness is now almost the norm.