deep sleep

Definitions

1. Used other than figuratively or idiomatically: see deep, sleep.
   countable, uncountable
2. stage 3 of non-rapid eye movement sleep
   countable, uncountable
3. Artificially induced hibernation in humans for the purpose of long distance space travel.
   countable, rare, uncountable

Equivalents

Examples

“Donnchadh and Gwalcmai, along with the other fourteen teams selected for planetary infiltration, had been put⟳ into deep sleep⟳ shortly after liftoff from their planet.”

“The Kironian had remained in deep sleep⟳ until alerted by a high-pitched squeaky sound⟳. When the Kironian woke, everything seemed as though it had just left Kiron.”

“There is also the possibility that our aliens perfected cryogenics and simply went into deep sleep⟳ until the environment improved.”

CEFR level