Peer-reviewed research

The Science Behind Drift

Drift is built on a specific, peer-reviewed sleep technique called Serial Diverse Imagining (SDIT) — developed by cognitive scientist Luc P. Beaudoin at Simon Fraser University and tested in a randomized controlled trial at the American Academy of Sleep Medicine's annual conference.

The Core Problem: Pre-Sleep Cognitive Arousal

Most sleep difficulties aren't caused by the body — they're caused by the mind.

Pre-sleep cognitive arousal is the technical term for a racing mind at bedtime: intrusive thoughts, mental replay of events, anticipatory worry, and the inability to disengage from goal-directed thinking. It's one of the most common reported causes of sleep onset difficulty.

Existing treatments — CBT-I, structured problem-solving, mindfulness — are effective but have practical limitations. Most require daytime practice, trained clinicians, or sustained effort that a sleep-deprived person cannot reliably maintain.

The Theoretical Framework

Beaudoin (2013) — SFU Summit Repository

Beaudoin proposed a framework distinguishing three types of pre-sleep mental activity: somnolent mentation (facilitates sleep), asomnolent mentation (neutral), and insomnolent mentation (interferes with sleep).

Insomnolent mentation — rumination, worry, goal-directed planning — shares a common feature: it's coherent. One thought leads to another in a chain the brain can follow.

Beaudoin proposed the solution was not to empty the mind, but to occupy it with something simultaneously engaging enough to displace structured thought and incoherent enough to prevent chain-building. He called this super-somnolent mentation.

The Randomized Controlled Trial

Beaudoin, Digdon, O'Neill & Rachor (2016)

Beaudoin, L. P., Digdon, N., O'Neill, K. & Rachor, G. (2016). Serial diverse imagining task: A new remedy for bedtime complaints of worrying and other sleep-disruptive mental activity. Poster presented at SLEEP 2016 — Joint Annual Meeting of the American Academy of Sleep Medicine and the Sleep Research Society. Denver, CO.

Design

Randomized controlled trial

Sample

154 university students

Inclusion

Excessive cognitive pre-sleep arousal (self-reported)

Conditions

SDIT · Structured Problem-Solving · SDIT + SP combined

Measurement points

Baseline · 1 week · 1 month

Results

All measures improved significantly (p < .001)

Measure

Direction

p-value

Effect size (η²)

Cognitive pre-sleep arousal

Decreased

< .001

.43 – .71

Somatic pre-sleep arousal

Decreased

< .001

.43 – .71

Sleep effort

Decreased

< .001

.43 – .71

Sleep quality

Improved

< .001

.43 – .71

Effect sizes in the .43–.71 range are classified as large by Cohen's conventions (threshold: .14). These are not marginal improvements.

Notable: sleep hygiene worsened during the study period (academic stress increased), yet sleep quality and arousal still improved — making the SDIT effect more conservative, not less.

“Beaudoin's Serial Diverse Imagining Task was as effective as Structured Problem-Solving in reducing pre-sleep arousal, sleep effort, and poor sleep quality. One advantage of SDIT is that it can be done at bedtime, unlike SP.”

— Beaudoin et al. (2016)

What the Research Does and Does Not Show

What it shows

  • –

    SDIT is an empirically tested technique, not a wellness trend

  • –

    In a controlled trial, it performed as well as the gold-standard clinical treatment for pre-sleep cognitive arousal

  • –

    Effect sizes are large (η² = .43–.71) and statistically robust (p < .001)

  • –

    It works at bedtime, without clinical supervision, without daytime preparation

What it does not show

  • –

    SDIT has not been tested in multi-site trials or with clinically diagnosed insomnia populations

  • –

    Long-term efficacy beyond one month has not been formally measured

  • –

    Drift as an application has not been independently studied — it implements the SDIT mechanism

  • –

    The 2016 study was a conference poster abstract, not a full peer-reviewed journal publication

References

  1. Beaudoin, L.P., Digdon, N., O'Neill, K. & Rachor, G. (2016). Serial diverse imagining task: A new remedy for bedtime complaints of worrying and other sleep-disruptive mental activity. SLEEP 2016 — Joint Annual Meeting of the American Academy of Sleep Medicine and the Sleep Research Society. Denver, CO.
  2. Beaudoin, L.P. (2013, updated 2015). Super-somnolent mentation, sleep-onset acceleration, and serial diverse imagining. Simon Fraser University Summit Repository. Item 12143.
  3. Haimov, I. & Shatil, E. (2013). Cognitive training improves sleep quality and cognitive function among older adults with insomnia. PLoS ONE. PMC3618113.
  4. Harvey, A.G. (2000). Pre-sleep cognitive activity: A comparison of sleep-onset insomniacs and good sleepers. British Journal of Clinical Psychology, 39(3), 275–286.