Sleep talking can occur in any sleep stage and is usually brief and fragmented.

The longer version

Speech during sleep can emerge from light, deep or dream-filled stages, and ranges from mumbles to short sentences. Whole conversations are rare, since most episodes last a few seconds and involve only a handful of words. Unlike sleepwalking it does not cluster in one stage, and the sleeper usually has no memory of it afterwards.

Recordings show that the utterances are often grammatically odd and hard to follow, matching the reduced coordination of the sleeping brain. Stress and fever make episodes more frequent. Some children talk in their sleep fairly often and grow out of it. Because the episodes are harmless, they are usually noticed only by a partner or by laboratory recording.

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.