Blind people often report dreams with sound, touch and smell rather than visual scenes.

The longer version

People blind from birth lack visual imagery to draw on, so their dream reports describe voices, music, textures, smells and movement through familiar spaces rather than scenes. The narrative structure remains much the same, and emotional content and social interaction appear at rates comparable to those in sighted reports.

Those who lost sight later in life often retain some visual content, and the amount tends to decline with years since the loss. Brain imaging suggests that visual areas remain active during sleep in people blind from birth, though the content differs. The finding suggests dreams are built from the sensory material a person has actually experienced.

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.