What about sleep homeostasis
{"Image DocumentName": "What about sleep homeostasis?", "Image ImageDescription": "Scientists are still looking for and learning about a possible sleepiness factor (SF). SF levels rise. Sleep homeostasis. AWAKE. ASLEEP. SF levels decrease.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}