It’s always the same story. You went to bed at a reasonable hour, didn’t eat too much, put your phone on airplane mode… and yet here you are, wide awake in the middle of the night, staring at the ceiling for no apparent reason.

It’s 3 a.m. Again. But what if this strange moment wasn’t just a coincidence?

The “hour of the wolf”: a legend that’s not so far-fetched?

In some cultures, the hours between 3 and 5 a.m. are poetically (and somewhat ominously) called the “hour of the wolf.” Popularized by Swedish filmmaker Ingmar Bergman, the term describes a time when inner anxieties rise to the surface, nightmares feel more vivid, and we’re at our most vulnerable.

But beyond cinema and Scandinavian folklore, this phenomenon also connects to something much more ordinary, yet just as intriguing: the way our bodies naturally function during deep sleep.

What science says: when the body slows down to its lowest point

Between 3 and 5 a.m., the body reaches a state of especially deep rest. During this time, body temperature drops, blood pressure decreases, and metabolism slows to its lowest level. It’s the heart of the circadian rhythm—the biological clock that regulates sleep in sync with daylight.

But here’s the catch: it’s also a time of fragility. For those prone to stress or anxiety, this extreme slowing of the body can paradoxically open the door to… an untimely wake-up. Thoughts start spinning, worries resurface, and suddenly the mind jolts us awake without warning.

Stress, caffeine, and screens: enemies of restful sleep

Waking up at 3 a.m. doesn’t necessarily mean that “something is wrong” deep down. More often, it’s triggered by very practical, everyday factors: that late cup of coffee, a TV series watched too late, or even a heavy or spicy dinner.

Another culprit is irregular sleep schedules. Going to bed at different times each night disrupts the body’s natural rhythm, making night wakings more likely.