Despite the importance of sleep, its purpose is a mystery.とは 意味・読み方・使い方

Despite the importance of sleep, its purpose is a mystery.

In fact sleep is vital to us.

Waking or sleeping, it's on my mind.

Sleep is basic to health.

Sleep is essential for the preservation of life.

Slow-wave sleep is the deepest sleep and is also called non-REM sleep.

It's necessary for us to sleep well.

Plenty of sleep is vital to children.

I made frantic efforts to drive away the drowsiness.

I lay down not so much to sleep as to think.

I'm not really asleep, just dozing.

People sometimes compare death to sleep.

the deep sleep into which a person falls while sleeping, called sleep

When I achieved my goal, I felt good and could sleep well that night.

a light [heavy] sleeper

I stopped worrying about it and went to sleep.

Sleep is necessary to health.

The brain waves during REM sleep are the same as when awake, and it's the stage when you have dreams.

People sometimes compare death to sleep.

We need it when asleep as well as when awake.

Sleep is the greatest thief, for it steals half one's life.

Yawning is a sign that you are sleepy or tired.

Sleep is more pleasant than death. At least, there's not much difference.

Sleep is necessary to good health.

Sleep is necessary for good health.

Some people cannot sleep unless they lie on their sides.

Sleeping is not a waste of time.

A good night's sleep will be of benefit to you.

Sleep is necessary to health.

Sleep is no less necessary to health than food.