As morning nears, sleep becomes lighter, reducing the duration of deep sleep phases. This shift occurs as the body naturally prepares for wakefulness. The closer we get to sunrise, the easier it is to be roused from sleep, a common experience for many. This is due to a natural transition in our internal body clock, also known as the circadian rhythm. The body anticipates the start of a new day and begins to suppress melatonin, a hormone promoting sleepiness. Consequently, the threshold for waking decreases, making even minor stimuli more likely to cause arousal. Understanding these sleep stage changes can help individuals adjust their sleep schedules and improve overall rest.