Causes and management of nighttime awakenings and insomnia

Waking up at the same time during the night, often between 2:00 and 4:00 AM, can be caused by several physiological and psychological factors. Natural fluctuations in cortisol levels, which prepare the body for morning wakefulness, can cause premature arousal in chronically stressed individuals. Other common causes include stress, sleep apnea, mineral deficiencies such as magnesium, sleep disorders, and environmental factors like high bedroom temperatures or late-night meals and alcohol consumption.

For those experiencing racing thoughts and cognitive arousal, the American Academy of Sleep Medicine (AASM) notes that standard sleep hygiene alone may not be sufficient to treat chronic insomnia. The AASM provides its strongest recommendation for multi-component Cognitive Behavioral Therapy for Insomnia (CBT-I). Effective strategies to manage cognitive arousal include stimulus control—such as leaving the bed if unable to sleep after a few minutes—and reducing the anxiety caused by monitoring the time, which can further exacerbate sleep difficulties.