Before electric lighting, people in many regions slept longer in winter than in summer.

The longer version

Without artificial light, bedtime followed sunset, and in winter the dark evening stretched far longer than in summer. Candle and oil use was expensive, so most households simply went to bed once it grew dark. Recorded sleep therefore varied with season, with the longest nights producing the longest time in bed.

Communities at high latitudes saw the largest swing, since daylight there changes dramatically across the year. Farm work and available daylight shaped the schedule more than personal preference did. Some researchers argue that the pre-industrial pattern was more flexible than modern schedules rather than merely longer. The seasonal variation largely vanished once lamps made evening hours usable year round.

Where this entry sits

This collection gathers curious details about sleeping and dreaming, from nightly brain stages and body clocks to naps, yawns and unusual animal habits. It also covers how bedtime customs have changed across centuries, without offering any advice. The full list sits on the Sleep and Dreams page, where every entry is listed in order.