| asleep | (adjective) in a state of sleep | - |
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| (adjective) dead | Synonyms: at peace, at rest, deceased, departed, gone |
| (adjective) lacking sensation | Synonyms: benumbed, numb |
| (adverb) into a sleeping state | - |
| (adverb) in the sleep of death | - |
| bleep | (noun) a short high tone produced as a signal or warning | Synonyms: beep |
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| (verb) emit a single short high-pitched signal | - |
| electrosleep | (noun) unconsciousness brought about by the passage of a low voltage electric current through the brain | - |
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| oversleep | (verb) sleep longer than intended | - |
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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 |
| (verb) be asleep | Synonyms: catch some Z's, kip, log Z's, slumber |
| (verb) be able to accommodate for sleeping | - |
| sleeper | (noun) an unexpected hit | - |
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| (noun) tropical fish that resembles a goby and rests quietly on the bottom in shallow water | Synonyms: sleeper goby |
| (noun) a passenger car that has berths for sleeping | Synonyms: sleeping car, wagon-lit |
| (noun) one of the cross braces that support the rails on a railway track | Synonyms: crosstie, railroad tie, tie |
| (noun) a piece of furniture that can be opened up into a bed | - |
| (noun) pajamas with feet; worn by children | - |
| (noun) a rester who is sleeping | Synonyms: slumberer |
| (noun) an unexpected achiever of success | - |
| (noun) a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal | - |
| sleepily | (adverb) in a sleepy manner | - |
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| sleepiness | (noun) a very sleepy state | Synonyms: drowsiness, somnolence |
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| sleeping | (adjective) lying with head on paws as if sleeping | Synonyms: dormant |
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| (noun) the suspension of consciousness and decrease in metabolic rate | - |
| (noun) quiet and inactive restfulness | Synonyms: dormancy, quiescence, quiescency |
| (noun) the state of being asleep | - |
| sleepless | (adjective) always watchful | Synonyms: lidless |
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| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, watchful |
| sleeplessly | (adverb) without sleep; in a sleepless manner | - |
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| sleeplessness | (noun) a temporary state in which you are unable (or unwilling) to sleep | Synonyms: wakefulness |
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| sleepover | (noun) an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children) | - |
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| sleepwalk | (verb) walk in one's sleep | Synonyms: somnambulate |
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| sleepwalker | (noun) someone who walks about in their sleep | Synonyms: noctambulist, somnambulist |
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| sleepwalking | (noun) walking by a person who is asleep | Synonyms: noctambulation, noctambulism, somnambulation, somnambulism |
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| sleepwear | (noun) garments designed to be worn in bed | Synonyms: nightclothes, nightwear |
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| sleepy | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepyheaded |
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| sleepyhead | (noun) a sleepy person | - |
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| sleepyheaded | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepy |
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| unsleeping | (adjective) fully awake | Synonyms: wide-awake |
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