Lucid dreaming is the experience of knowing you are dreaming while the dream continues.

The longer version

Lucid dreaming occurs when awareness returns partway through a dream: the dreamer recognises the scene as unreal yet the imagery keeps running. Studies link the state to increased activity in frontal regions that are normally quiet during sleep. Some dreamers also gain a degree of control over the plot, though how much varies between people and between episodes.

Reports appear in old contemplative texts, and laboratory work confirmed the phenomenon by asking trained dreamers to signal with prearranged eye movements while asleep. Estimates of how often it happens vary widely between surveys, and some people report inducing it with practice. The state has attracted interest as a way to study consciousness without ordinary sensory input.

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.