We had a sound sleep.

Tom awoke from a deep sleep.

I'm feeling a bit sleepy.

And we could take a very simple view and say, well, it is that which we lose when we fall into deep sleep without dreams, or when we go under anesthesia, and it is what we regain when we recover from sleep or from anesthesia.

This is a beautiful, new device that gives you detailed sleep tracking data, not just whether you're asleep or awake, but also your phase of sleep deep sleep, light sleep, REM sleep.

I'm feeling a bit sleepy.

The ability to get additional sleep on the way to work is attractive to many commuters using public transport.

Older people tend to sleep less overall but sleep in REM for about the same absolute time, and therefore spend a greater proportion of sleep in REM.

There is now a kind of sleep deprivation one upmanship.

Sleep is the best medicine for a cold.

Tom had a heart attack and died in his sleep.

I slept much more lightly than usual.

Are you sleepy?

I'm a light sleeper.

I'm not sleepy.

I'm sleepy.

I feel sleepy.

I'm a heavy sleeper.

References

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

Tom fell asleep while he was driving and caused an accident.

Tom fell asleep while driving and caused an accident.

Tom fell asleep at the wheel and caused an accident.

There have been multiple studies conducted under placebo controlled conditions.

The REM sleep, rapid eye movement, dream state, is in light green and light is gray, light sleep and deep sleep, the best restorative sleep, is that dark green.

Let's take an example.

May I take a shower?

I want to take a bath.

Let's go for a coffee?

Let's get some coffee.

I will drink some acai.

Can I have a cup of coffee?

Let's have some coffee.

I have to shower.

And sleep disorders.

Are you sleepy?

Aren't you sleepy?

Aren't you sleepy?

Aren't you sleepy?

I'm still sleepy.

I fought against sleep.

I was sleepy.

I'm not asleep, meh.

You're sleepy.

You're sleepy.