| 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 |
| sleeping | (adjective) lying with head on paws as if sleeping | Synonyms: dormant |
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| sleepless | (adjective) always watchful | Synonyms: lidless |
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| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, watchful |
| sleepy | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepyheaded |
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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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