| hypersomnia | (noun) an inability to stay awake | - |
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| insomnia | (noun) an inability to sleep; chronic sleeplessness | - |
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| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| somnambulation | (noun) walking by a person who is asleep | Synonyms: noctambulation, noctambulism, sleepwalking, somnambulism |
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| somnambulism | (noun) walking by a person who is asleep | Synonyms: noctambulation, noctambulism, sleepwalking, somnambulation |
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| somnambulist | (noun) someone who walks about in their sleep | Synonyms: noctambulist, sleepwalker |
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| somniloquism | (noun) uttering speech while asleep | Synonyms: sleep talking, somniloquy |
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| somniloquist | (noun) someone who talks while asleep | - |
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| somniloquy | (noun) uttering speech while asleep | Synonyms: sleep talking, somniloquism |
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| somnolence | (noun) a very sleepy state | Synonyms: drowsiness, sleepiness |
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