# Why the sentences get shorter

> As we fall asleep, thought turns fragmentary and stops looking ahead. Why a sleep story’s sentences should shrink and its pauses lengthen to match.

Source: https://dreamsheeps.space/learn/shorter-sentences
Published: 2026-09-28 · Updated: 2026-10-14

As we fall asleep, we stop thinking about the future.

Speth and colleagues collected reports of hypnagogic mentation — the fragmentary stuff of the minutes before sleep — and ran a linguistic analysis over them. The finding is in the title of the paper: as we fall asleep we forget about the future. Forward-looking language drains away as sleep approaches.

Sleep-onset thought turns to images, too. What people report from those minutes ranges from a fleeting, isolated picture to a full-fledged dream, and much of it is closer to a slideshow with the projector slipping than to a story.

A Sheeps story imitates that decline rather than merely getting quieter. It opens at fourteen to eighteen words a sentence and ends at four to eight. The silences between its scenes grow from two seconds to seven. The grammar simplifies — subordinate clauses thin out and are gone by the last third. The words themselves get plainer. And forward-looking language is gone from the final third.

> A story that ends in short sentences which are still forward-looking has decayed on one axis out of four.

All four are measured. They are what the story generator was tuned against, scored on sentence-length decay, syntactic decay, vocabulary decay, and how much forward-looking language survives into the final third — and every story it writes is measured again for shortening sentences, while its pauses are set to grow from two seconds to seven.

## The longer answer

The state those sentences are matching has a name, [hypnagogia](https://dreamsheeps.space/hypnagogia): the stretch between waking and sleep when sentences give way to images and fragments and the mind stops planning ahead. [What happens when you fall asleep](https://dreamsheeps.space/what-happens-when-you-fall-asleep) follows the same minutes in the body and the brain, and [how a Sheeps story is made](https://dreamsheeps.space/how-it-works) shows the rule in practice — sentences that open at fourteen to eighteen words and end as fragments of four to eight.

## Sources

1. [Speth, Schloerscheidt & Speth (2016) — As we fall asleep we forget about the future](https://doi.org/10.1016/j.concog.2016.08.014)
2. [Embracing sleep-onset complexity — Trends in Neurosciences (2024)](https://doi.org/10.1016/j.tins.2024.02.002)

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Sheeps is the iPhone app these articles explain: a new sleep story, written for you, with nothing to follow, read by a calm narrator and thinning out into silence. Sheeps on the App Store: https://apps.apple.com/app/id6749510901