Reciprocal Interactions Between Wakefulness and Sleep Influence Global and Regional Brain Activity

Reciprocal interactions between wakefulness and sleep substantially influence human brain function in both states of vigilance. On the one hand, there is evidence that regionally-specialized brain activity during wakefulness is modulated by the interaction between a local use-dependent buildup of homeostatic sleep pressure and circadian signals. On the other hand, brain activity during sleep, although mainly constrained by genuine sleep oscillations, shows wakedependent regionally-specific modulations, which are involved in the dissipation of local homeostatic sleep pressure and memory consolidation.