They are usually connected to the body’s natural sleep cycles, stress levels, physical discomfort, or small disturbances in the environment.
Sleep occurs in cycles lasting around 90 minutes, moving between deep sleep, light sleep, and REM sleep. During the transitions between these stages, the brain briefly enters a lighter state of sleep. In the early morning hours, the body begins spending more time in lighter and REM sleep, making it easier to wake up. Small changes in temperature, outside noises, a pet moving, digestive activity, or fluctuations in blood sugar can suddenly become noticeable and interrupt sleep.

Stress and anxiety are also common causes of waking up during this period. Cortisol, the hormone that helps the body prepare to wake up, naturally begins rising in the early morning. When a person is already stressed, this increase may happen too early or too strongly, causing sudden alertness. Checking the clock can make the problem worse because the brain begins associating that specific time with worry, frustration, and insomnia, eventually creating a repeated habit of waking up at the same hour.

To break the cycle, avoid checking the time when you wake up and keep your phone or clock out of sight. If you remain awake for more than 15 to 20 minutes, leave the bed and do something quiet in a dimly lit room until you feel sleepy again. Heavy meals, alcohol, caffeine, and bright screens should also be avoided before bedtime. By reducing stress, improving your evening routine, and understanding how sleep cycles work, you can retrain your brain and gradually return to more restful, uninterrupted sleep.