| bleep | (noun) a short high tone produced as a signal or warning | Synonyms: beep |
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| electrosleep | (noun) unconsciousness brought about by the passage of a low voltage electric current through the brain | - |
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| sleep | (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: slumber |
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| (noun) euphemisms for death (based on an analogy between lying in a bed and in a tomb) | Synonyms: eternal rest, eternal sleep, quietus, rest |
| (noun) a torpid state resembling deep sleep | Synonyms: sopor |
| (noun) a period of time spent sleeping | Synonyms: nap |