Waking in the middle of the night or near dawn is never pleasant, especially on the night before early morning work. Not only does the body fail to rest enough, but the brain is also not fully recharged, leading to confusion, drowsiness, and lack of freshness throughout the day. When we try to fall back asleep, it becomes difficult because the brain starts pulling us into endless thoughts from past to present.
If observed, people commonly wake between 3 and 4 AM, sometimes at 5 AM, depending on the case. According to ancient beliefs, 3 AM is when spirits and ghosts are said to appear, causing people to suddenly awaken. Repeated portrayals of this in Thai horror films reinforce this belief, making people fear waking up in the middle of the night.
Similarly, in the West, it is believed that 3 and 4 AM are the hours of the devil or evil, since, according to Christian belief, Jesus died on the cross at 3 PM. The appearance of ghosts and evil spirits is thus placed at the opposite time, 3 AM, when the gate between the living and the dead opens. Waking at this time is thought to mean spirits are watching us while we sleep.
Moreover, the belief linking evil spirits to waking at this time appears in many folk tales, suggesting that waking at 3 AM has long been recognized and needed explanation through often grim stories. In reality, the phenomenon of waking at 4 AM, explained scientifically, also reflects troubling conditions in our bodies.
Why do we wake up at 3 or 4 AM?
First, we must understand that waking at this time does not happen to everyone but can occur at any age, especially between 20 and 40 years old. Causes vary depending on individual lifestyles, but the main factor relates to bodily functions that may change nightly.
The first factor is the sleep cycle. People do not experience one continuous deep sleep until waking but cycle through phases lasting 90 to 120 minutes, from light sleep to deep sleep, followed by REM (Rapid Eye Movement), when dreaming occurs. Early in sleep, deep sleep predominates, but around 3 or 4 AM, the brain’s deep sleep quota is used up, leaving lighter sleep alternating with REM. Thus, disturbances like light, needing to urinate, room temperature changes, or noise can easily wake us.
Another factor is the body’s hormones. During sleep, two main hormones regulate the cycle: melatonin (which makes us feel sleepy) and cortisol (a stress hormone that can cause awakening). Around 3 to 4 AM, melatonin levels decline while cortisol rises to prepare us to wake. Because cortisol is linked to stress, higher stress levels increase the likelihood of waking. This explains the saying, “People under stress often wake in the middle of the night,” which can happen at any age, including adolescence.
Another annoyance is recalling memories from the past or events from the day, which people waking at night often struggle with to fall back asleep. At 3 AM, the prefrontal cortex, responsible for reasoning and problem-solving, is offline, but the amygdala—an area controlling emotions like fear, anger, and survival instincts—remains active. This causes anxiety and unconscious rumination about past events while awake in the early morning.
Other factors increasing early waking include alcohol consumption. Although alcohol helps induce sleep, as the liver metabolizes it during sleep, a rebound effect can cause sudden awakening and poor sleep quality. Age also plays a role; as people get older, deep sleep becomes harder to achieve, making early waking normal for middle-aged and elderly individuals, explaining why older people tend to rise early.
What should you do if you wake up and want to fall back asleep?
Imagine waking up and seeing the clock showing 3:30 AM. Your mind is alert, eyes wide like after drinking coffee, suddenly remembering an early morning meeting. Trying to fall back asleep feels like trying to nap after waking—difficult. So, what should you do?
Start by not looking at the clock.
Glancing at the clock is a bad start because seeing the time reminds the brain you have only two to three hours left to sleep, increasing heart rate and alertness. When you wake in the middle of the night, remain still and calm.
Control your awareness while lying down.
If you realize you cannot return to sleep, close your eyes and try to control your thoughts—perhaps by counting numbers starting from one, similar to the ‘counting sheep’ method. This technique, called cognitive shuffling, mimics the thought process before entering REM sleep.
Another approach is mindfulness, which Matthew D. Lieberman, a psychology professor at UCLA, says is similar to Buddhist meditation. This involves recognizing and acknowledging your current emotions or states, for example, saying to yourself, “I am unable to sleep right now,” or “I am thinking about tomorrow.” This awareness helps regulate amygdala activity.
Get out of bed.
If counting numbers doesn’t work and you start feeling frustrated, get out of bed because forcing sleep there will increase stress.
Engage in activities under dim light.
Do activities that minimally stimulate your body, usually boring ones that quickly induce boredom. Try rereading a book, reviewing an appliance manual, or listening to a monotonous podcast. Avoid using your phone because blue light is stimulating. Keep the light dim to maintain melatonin production.
Return to bed when your eyelids feel heavy.
Don’t go back to bed until you feel very sleepy. When you start yawning repeatedly and your eyelids droop heavily, then try lying down again.
Finally, do not let your brain torment you when waking at night. No matter how far your mind wanders, or what regrets or worries about the future arise, consider it a prank of the brain. Everything will fade by morning. The important thing is to reclaim rest because nothing is more vital than allowing the body to recover from fatigue and prepare for the next day, which likely holds better things than the early morning trap of overthinking. For those who consistently wake at 3 or 4 AM over a long time, even in youth, this is a warning sign of hidden stress or anxiety; consulting a doctor is the best way to maintain long-term health.
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