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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
(medical dictionary) Definition of SOMNI- : sleep. somni- :(identical for regular) hypersomnia: (medical dictionary) 1: sleep of excessive depth or duration, 2: the condition of sleeping for excessive periods at intervals wit intervening periods of normal duration of sleeping and waking â compare narcolepsy.