Homeostatic sleep pressure is an ever-increasing urge to sleep during wakefulness. Ultimately, it allows the person to sleep again at the end of the day. Homeostatic sleep pressure decreases when you fall asleep until you wake up in the morning. Then it begins to increase gradually again during the day. This routine ensures that a person maintains a proper sleep-wake cycle. It is an essential physiological mechanism that regulates sleep hours, working alongside the circadian rhythm, which controls sleep timing.