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Rudely awakening at 3AM is extremely typical and often has apparent biological causes as opposed to anything spooky. Sleep is followed by 90-minute cycles. When it is early in the night, you get more deep restorative sleep, but as the morning sounds closer (3-4 AM on average when you bed at 10-11 PM), you have more time in light REM sleep, and it becomes easy to wake up due to any little disturbance.

By this time of the day, your body will naturally begin to produce a lot of cortisol—the hormone that makes you feel awake and ready to begin the day. In a normal human being, we can slowly see this go up, but when you are stressed or anxious or even have a high level of cortisol in a day because of everyday stresses, then this can literally wake you up. The sympathetic nervous system is stimulated by stress, making a smooth transition a shock.

Other common triggers are:

• Elevations in blood sugar (low glucose at night encourages adrenaline and cortisol secretion).
• Such environmental issues as noise, light, room temperature, or the need to go to the bathroom.
• Habits like late caffeine/alcohol and irregular shifts, or an underlying condition like sleep apnea, insomnia, or hormonal changes.

The 3 AM wakings are usual—the majority of the people momentarily awaken between cycles without recollection. However, when you frequently have trouble falling back to sleep, enhance sleep hygiene: try to go to bed at the same time, keep the room cool and dark, limit evening screen time, be careful of daytime stress, and do not eat too much or have naps just before bedtime. When it continues, see a physician to eliminate sleep disorders. With a few changes, it is possible to improve rest.