TY - JOUR AU - Fang, Zhuo AU - Rao, Hengyi PY - 2017 TI - Imaging homeostatic sleep pressure and circadian rhythm in the human brain JF - Journal of Thoracic Disease; Vol 9, No 5 (May 28, 2017): Journal of Thoracic Disease Y2 - 2017 KW - N2 - It is well-known that our sleep-wake patterns and alertness level during wakefulness are mainly modulated by two interactive processes, a homeostatic sleep debt process (S) refers to the drive for sleep that increases as a saturating exponential when we stay awake and decreases exponentially when we sleep, and a circadian processes (C) refers to the internal oscillatory rhythm that runs about 24 hours and can be reset by the environmental light (1-3). UR - https://jtd.amegroups.org/article/view/13329