单项选择题

What is TRUE of human sleep

A．Most people need less sleep when grown older.
B．Most people need seven and a half hours of sleep every night.
C．On average, people in the US today sleep less per night than they used to.
D．Most people need more sleep when they are under pressure.

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热门试题

单项选择题

For our bodies to function properly, we should ______.

A．sleep for at least eight hours per night
B．believe that we need less sleep as we age
C．adjust our activities to new environment
D．be able to predict the rhythms of our biological clocks

单项选择题

Which of the following measures can help you sleep better

A．Staying up late.
B．Taking a hot bath.
C．Having late meals.
D．Traveling between time zones.