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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
Many males occasionally, wake up in the middle of the night with wet sheets and underpants. When this happens, they are probably experiencing something called nocturnal emissions, or wet dreams.. A nocturnal emission is an involuntary ejaculation of semen that occurs during sleep.