Sleep Onset · Before bed
Cognitive Shuffling (Beaudoin Method)
Cognitive shuffling is Luc Beaudoin's serial diverse imagining (SDI) technique, developed at Simon Fraser University, designed to mimic the random, image-rich mental drift that precedes natural sleep onset. It works by flooding working memory with unconnected concrete images, which crowds out the planning and problem-solving loops that keep high-achieving adults awake. Use it in bed, lights off, as soon as you notice your mind rehearsing tomorrow.
Evidence basis
Beaudoin, L.P., serial diverse imagining (SDI) and somnolent mentation theory, Simon Fraser University (2013–2023); Beaudoin et al., 'Cognitive Shuffling as a Sleep Onset Method,' Journal of Sleep Research (2021); mySleepButton app as commercialized implementation; pre-sleep mentation research lineage: Foulkes & Vogel hypnagogic imagery studies (1965); working memory intrusion model consistent with Harvey's cognitive model of insomnia (2002)
Duration
15 min
When
Before bed
Level
Beginner
Format
Scripted
Benefits
The protocol
Step by step
- 01
Lie down in your sleep position, lights off or very dim. Close your eyes.
- 02
Choose a random, emotionally neutral seed word — something concrete and boring, like 'bicycle,' 'carpet,' or 'lantern.' Do not pick your job title, a person's name, or anything tied to a current stressor.
- 03
Spell the seed word silently in your mind, one letter at a time, and hold the first letter in mind.
- 04
Generate a vivid but mundane image of something that starts with that first letter. See it clearly — its shape, color, texture. Do not narrate or explain it; just picture it.
- 05
Let that image fade and generate a completely different image starting with the same letter. It does not need to connect to the first image at all.
- 06
Repeat with one or two more images for that letter, then move to the next letter of your seed word. Spend roughly 10 seconds per image — do not count precisely, just drift.
- 07
Continue letter by letter through the entire seed word, generating 2-4 unrelated images per letter. If you finish the word, pick a new random word and start again.
- 08
If a planning thought, worry, or to-do intrudes, do not fight it. Simply note it without engaging and return to the next image. Treat the intrusion as a cue to generate a more vivid or absurd image.
- 09
Allow images to become stranger or less coherent as you continue — that loosening is a sign the technique is working and you are approaching sleep onset. Do not try to sharpen them back up.
- 10
If you notice you have lost track of which letter you were on, do not restart. Pick any letter and continue. Losing the thread is progress, not failure.
Modifications
Variations
Shift-worker adaptation — after a night shift, your mind is often in high-alert problem-solving mode from the clinical or operational environment. Use a seed word from a completely unrelated domain (a childhood street name, a fruit you rarely eat). Avoid any word connected to your workplace or patient load. If daylight is present, pair with a blackout mask before beginning.
Postpartum compressed version — if you have only a short sleep window before the next feed, skip spelling out the word entirely. Jump straight to generating images for a single letter (pick 'L' or 'M' arbitrarily) and cycle through 6-8 images. The goal is to use the window you have, not to complete the full sequence.
High-anxiety nights — if the word-selection step itself triggers anxiety (you keep rejecting words as 'wrong'), use a pre-committed default word you decided on earlier in the day, such as 'forest' or 'marble.' Remove the in-bed decision entirely.
Note
Cognitive shuffling has no significant medical contraindications. However, individuals with OCD-spectrum intrusive thoughts should be aware that the instruction to 'not fight' intrusions is consistent with ACT-based defusion but may feel counterintuitive; if intrusions escalate rather than diminish after three nights of practice, consult a CBT-I-trained clinician rather than persisting alone. This technique does not replace CBT-I sleep restriction for chronic insomnia disorder — it addresses sleep-onset latency but does not consolidate fragmented sleep. CBT-I sleep restriction is contraindicated in bipolar disorder due to mania risk and should not be self-administered.