crepuscular

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crepuscular

(krē-pŭs′kū-lăr) [L. crepusculum, twilight]
Pert. to twilight; used to describe a twilight mental state.
Medical Dictionary, © 2009 Farlex and Partners

crepuscular

pertaining to organisms which are active in the twilight hours.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005