First Sleep and Second Sleep History

Imagine waking up in the middle of the night, not because of a crying baby or a restless bladder, but because your body expects it. You stretch, chat with your partner, sip some herbal tea, read a scroll by candlelight, and then, after an hour or so, you drift back into a deep, dream-filled second sleep. This was not a rare occurrence for our ancestors. It was the norm. Before the industrial revolution and the invention of bright artificial light, most humans naturally slept in two distinct blocks every night: a “first sleep” (or “dead sleep”) and a “second sleep” (or “morning sleep”). Understanding this ancestral pattern isn’t just a historical curiosity. For many of today’s sleep-deprived Americans, rediscovering these polyphasic rhythms may hold the key to deeper, more restorative rest.

The evidence for segmented sleep is surprisingly solid. Historian Roger Ekirch of Virginia Tech spent decades combing through pre-industrial diaries, court records, medical texts, and even literature from Homer to Chaucer, finding references to this pattern everywhere. People spoke of coming home to their “first sleep” and waking for their “first waking” before settling into their “second sleep.“ In 16th-century France, midwives even timed their visits based on these natural breaks. This wasn’t a quirky habit of the wealthy, either. Across Europe and the Americas, from peasants to kings, segmented sleep was the standard, woven into the fabric of daily life. The dark, cold nights offered little to do but rest, and without electric lights, the body naturally followed a pattern that felt both natural and restorative.

So, what happened? The culprit was not an alarm clock or caffeine, but the light bulb. In the late 19th and early 20th centuries, street lamps, gas lights, and eventually electric bulbs began to push back the darkness. Suddenly, the night became a time for productivity, socializing, and reading. The long, quiet pause in the middle of the night that once facilitated the first and second sleep began to disappear. People started staying up later and sleeping in one long block, a pattern that became the modern ideal. The industrial era valued efficiency, and a single, uninterrupted sleep aligned perfectly with factory schedules. The segmented rhythm was quickly labeled as “broken sleep” or even a medical problem, despite the fact that it had been humanity’s default for millennia.

What does this mean for you today? If you have ever woken up at 2:00 or 3:00 a.m. and felt anxious about not getting back to sleep, you are not broken. You might be experiencing a ghost of your ancestral rhythm. The panic that follows waking in the middle of the night is a modern invention. Historically, that wakeful period was a gift. It was a time for quiet reflection, intimacy, prayer, or simply staring into the hearth. The first sleep was thought to be deeper and more dream-heavy, while the second sleep was lighter and closer to dawn. This natural break aligns with our body’s hormonal cycles. Levels of prolactin, a hormone linked to relaxation and breast milk production, actually peak during this middle-of-the-night waking period. Cortisol, the stress hormone, remains low, creating a window of calm alertness that is very different from the groggy panic many people feel today.

For those looking to optimize their sleep, you don’t need to literally go back to using candles and a fireplace. But you can take a few lessons from the past. If you find yourself waking in the night and struggling to return to sleep, try not to fight it. Instead, embrace that hour as a second bedtime. Get up, use a dim red light or candle, and engage in a quiet, relaxing activity. Read a book, do some gentle stretching, or write in a journal. Avoid screens and bright lights, which will suppress melatonin and trick your brain into thinking it is morning. You may find that within 30 to 60 minutes, you feel drowsy again and can slip into a refreshing second sleep. Many people who adopt this approach report feeling more rested and calm throughout the day.

Of course, modern life is not designed for two sleep periods. Work schedules, family commitments, and social obligations often make segmented sleep impractical for most adults. But the key takeaway is this: your midnight restlessness is not a flaw in your biology. It is a reminder of a deeper, older rhythm that your body remembers. By forgiving yourself for waking and giving yourself permission to simply rest without forcing sleep, you can reduce anxiety and improve your overall sleep quality. The science of sleep is still young compared to the long history of human rest. By understanding the first and second sleep, you can shift your perspective from fighting your body to trusting its ancient wisdom.