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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
Bone pain, fever, easy bruising and bleeding, fatigue, enlarged spleen and liver, night sweats. A chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep. Falling asleep without warning (anywhere, anytime), loss of muscle tone, sleep paralysis, hallucinations.