dead sleep

The term "dead sleep" is often used to describe a very deep or particularly sound sleep.

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Definition

B2General

(informal)A state of deep, uninterrupted sleep that is hard to wake from.

Example

After the long hike, he fell into a dead sleep and didn't wake up until morning.

C1Sleep Patterns

(technical, academic)The first phase of sleep in a biphasic sleep pattern, typically occurring early in the night.

Example

In historical biphasic sleep patterns, the dead sleep was followed by a period of wakefulness before the second sleep.

Similar

Terms that have similar or relatively close meanings to "dead sleep":

deep sleep eternal sleep dead to the world sleep on sleep of the just living dead fat sleeper sleeping power fall asleep sleep in sleeping language put to sleep dead and buried dead water dead hand dead stick dead stand sleep flower slept on sleepy sand play dead dead ground dead meat dead in the water sleep with dead calm snooze off beauty sleep