Sleeping soundly through the night without waking is rarer than most think, yet it’s essential for feeling fully rested and productive the next day. Many go to bed on time but still wake between 3:00 a.m. and 5:00 a.m., often struggling to fall back asleep.
This isn’t mere coincidence. Those early morning hours—sometimes called the hour of the wolf, a term popularized by filmmaker Ingmar Bergman and rooted in Swedish folklore—are believed to be when sleep is deepest, nightmares most vivid, and both births and deaths most common. Folklore also links this “witching hour” to heightened supernatural activity.
Physiologically, around 4:00 a.m. the body’s temperature, blood pressure, and metabolism reach their lowest point as part of the circadian rhythm. For most, this is the time of deepest rest—but for those prone to anxiety, it’s also when worries can feel most intense, often leading to sudden wakefulness.