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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
Paroxysmal nocturnal dyspnea is an intense form of orthopnea. It commonly occurs several hours into sleep (as opposed to immediately upon lying down), and it's relieved by sitting upright, but not as quickly as is orthopnea.