Cognitive Shuffle
A drug-free way to fall asleep faster: let a stream of random, unrelated words drift past and picture each for a moment. This "serial diverse imagining" crowds out the worry-loops that keep you awake — mimicking how the mind naturally drifts into sleep.
Voice playback isn’t supported in this browser — words show on screen.
Lie down with the screen dimmed and the volume low. Picture each word for a second — no effort, no story — then let it go. If your mind drifts back to your day, just return to the next word. Educational sleep aid, not a treatment for clinical insomnia; see a clinician if sleep problems persist.
See what actually helps you sleep
ONDA Life tracks how wind-down habits like this move your real sleep, HRV and recovery — so you can keep what works and drop what doesn’t.
Download ONDA Life on the App Store →Sources & methodology
Cognitive shuffling — formally "serial diverse imagining" — was developed by cognitive scientist Luc Beaudoin (Simon Fraser University). The idea: deliberately imagining a stream of random, unrelated, concrete objects mimics the loose imagery the brain drifts through just before sleep, and blocks the coherent worry-loops and planning that keep cognitive arousal high. A randomised study by Digdon & Beaudoin (n=154) found the task improved sleep quality, time to fall asleep and pre-sleep arousal. Evidence is still early (small, mostly-student samples, conference-reported), but the technique is free, drug-free and very low-risk. This player presents one neutral word every few seconds; picture each one briefly, without forcing it, and let your attention wander. It is a sleep aid, not a treatment for clinical insomnia — see a clinician if sleep problems persist.
- [1] Beaudoin LP (2014). A design-based approach to sleep-onset and insomnia: super-somnolent mentation, the cognitive shuffle and serial diverse imagining. Proceedings of the 36th Annual Conference of the Cognitive Science Society.
Origin of the cognitive shuffle / serial diverse imagining technique and its sleep-onset rationale.
- [2] Digdon N, Beaudoin LP (2016). Serial diverse imagining task: a new remedy for bedtime complaints of worrying and other sleep-disruptive mental activity. SLEEP 2016 (AASM & Sleep Research Society annual meeting), Denver, CO.
Randomised study (n=154 students) showing improved sleep quality, sleep-onset difficulty and pre-sleep arousal.
Common questions
What is cognitive shuffling?
Cognitive shuffling (or "serial diverse imagining") is a bedtime mental exercise: you picture a series of random, unrelated, concrete objects — mushroom, fence, telescope — for a moment each. The disconnected imagery resembles what your brain naturally does as it falls asleep, and it interrupts the runaway thinking and worrying that keep you awake.
Does cognitive shuffling actually work?
There is promising early evidence. A randomised study by Digdon & Beaudoin (154 students) found the technique improved sleep quality, difficulty falling asleep and pre-sleep arousal, with benefits lasting across a semester. It is not a cure for clinical insomnia and the research base is still small, but it is free, drug-free and very low-risk to try.
How do I use this tool?
Lie down comfortably with the screen dimmed, press start, and let the words come one at a time. Picture each word for a second or two — no effort, no story, no judging — then let it go as the next appears. If your mind wanders back to your worries, just return to the next word. Many people drift off before the list runs long.
Why random, neutral words instead of relaxing imagery?
Guided relaxation, "sleep journeys" and structured visualisation still require focused attention and a coherent thread — which keeps part of the mind engaged. Random, unconnected words do the opposite: they give the mind something harmless and incoherent to chew on, closer to the fragmented imagery of sleep onset, so it can let go rather than lock onto a thought.
Where does this technique come from?
It was developed by cognitive scientist Luc Beaudoin at Simon Fraser University, who described "serial diverse imagining" and the "cognitive shuffle" (Beaudoin 2014) and studied it with Nancy Digdon (2016). Full citations are in the Sources section on this page.