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REM sleep
This term refers to a specific physiological state rather than a general activity. It is used primarily in medical, psychological, and biological contexts to describe the phase of the sleep cycle where the brain is highly active and the body is mostly paralyzed.
Because it describes a specific biological state or phenomenon, it is treated as an uncountable noun. You would not refer to "three REM sleeps" in a single night, but rather to "periods of REM sleep" or "cycles of REM sleep."
Meanings
Examples
I wonder if I spent enough time in REM sleep last night.
Alcohol can significantly suppress the amount of REM sleep you get.
The brain is nearly as active during REM sleep as it is when awake.
You are usually in REM sleep for longer periods toward the morning.
My fitness tracker says I only had an hour of REM sleep.
Muscle paralysis occurs during REM sleep to prevent us from acting out our dreams.
Did you know that infants spend a much larger percentage of their time in REM sleep?