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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
A nocturnal panic attack is a panic attack which occurs in the midst of your sleep, waking you up for no apparent reason. Not very much is written about nocturnal attacks, so people are usually dismayed and worried when they experience a panic attack at night.