What Makes a Person Suddenly Wake Up at Night – Scientists' Answer

Researchers have identified reasons for sudden nighttime awakenings, especially between 3 and 5 a.m. Factors include biological rhythms, stress, sleep apnea, dry air, glucose fluctuations, and heavy dinners. Tips for better sleep: avoid heavy meals and coffee, keep the bedroom cool, and limit gadgets. The article is general in nature, without references to specific studies.

Researchers have identified several causes that can disrupt sleep in the middle of the night. Waking up at the same time each night, especially between three and five in the morning, is quite common. This may be linked to a person's biological rhythms as well as physiological and psychological factors. Closer to morning, sleep becomes lighter: the duration of light and REM sleep increases, making it easier to be awakened by noise or internal sensations. At the same time, the body prepares for waking: melatonin levels drop, while cortisol and adrenaline rise. In chronic stress or anxiety, these changes may occur earlier and trigger sudden awakenings. In Eastern traditional medicine, the period from three to five in the morning is associated with the lungs and respiratory system. However, from a scientific perspective, regular awakenings at these hours may be related to sleep conditions or breathing patterns. For example, overly dry or stuffy air can irritate the airways. Another possible factor is episodes of sleep apnea, where brief pauses in breathing can cause awakening. Nighttime glucose fluctuations can trigger cortisol release, which stimulates the nervous system and may disrupt sleep. Discomfort can also arise after a heavy or rich dinner, as digestion continues at night and interferes with rest. Nighttime awakenings are often linked to stress and emotional tension. To wake up less often at night, avoid heavy, fatty, and salty foods before bed, and limit coffee and strong tea in the afternoon. Keep the bedroom cool, fresh, and comfortably humid. Before sleep, avoid anxious news and gadgets, replacing them with reading or a calm walk. If you can't fall back asleep after about 20 minutes, get up, do something relaxing in dim light without screens, and return to bed when you feel sleepy again.