Forward this to a friend who sleeps badly.

The speaker is silent. Your brain has appointed itself the replacement DJ.

A chorus that keeps returning is a familiar nuisance. At bedtime, it raises a more useful question than whether a playlist sounds relaxing: does it actually leave you alone afterward?

This week we revisit a 2021 experiment, not a new breakthrough. Its result complicates one tidy assumption about bedtime music. It also leaves plenty unresolved.

The researchers surveyed 199 people. More music listening and nighttime earworms were associated with poorer sleep. That association cannot establish cause.

In a laboratory experiment, 50 young adults were recruited and 48 completed the study. Participants were randomly assigned familiar songs with lyrics or instrumental versions before an overnight sleep recording. The instrumental group took longer to fall asleep and had lower sleep efficiency on the overnight recording. Total sleep time did not differ. More people in the instrumental group reported a nighttime earworm (52% vs. 28%), but in this small sample that difference fell just short of statistical significance.

There was no quiet, no-music comparison group. The experiment cannot tell us whether all bedtime music is worse than silence, or settle what works for every listener.

“Relaxing” is a description of an experience. “Improves sleep” is a claim that needs a comparison.

Those two phrases often travel together in product descriptions, playlist names, and friendly advice. Separating them makes the discussion more useful. A track can sound gentle while remaining memorable. A listener can enjoy an evening routine without having evidence that the routine improves every part of the night.

The lab participants were healthy young adults, average age about 21, with no diagnosed sleep disorders. Its particular songs and laboratory setting also limit how far we should generalize. Your favorite ambient recording, unfamiliar instrumental piece, or quiet room was not automatically represented by this experiment.

“Instrumental means sleep-friendly.”

That is too broad. This experiment compared instrumental and lyrical versions of familiar songs. It did not test every genre, every volume, every timing choice, or every listener.

A better question is narrower: what exactly was compared, and what outcome was measured? A pleasant label is not a substitute for that answer.

For shared households, sound is also a negotiation. The person who enjoys background music and the person who wants silence may both have reasonable preferences.

A useful conversation can begin with the practical details: when the speaker stops, whether sound reaches another room, and whether anyone wants a quieter wind-down. A scientific paper does not need to referee every disagreement over the Bluetooth speaker.

A/B question: which is more familiar to you?

A. The song ends when the speaker stops.
B. The chorus signs itself up for overtime.

Reply with A or B. This is a conversation starter, not a scientific survey.

Scullin, Gao & Fillmore (2021), Bedtime Music, Involuntary Musical Imagery, and Sleep. Psychological Science. Primary paper: https://doi.org/10.1177/0956797621989724

Open data and materials: https://osf.io/7tfqz/

Research transparency: the authors declared no conflicts of interest. Funding came from the U.S. National Science Foundation; the paper states that the funders had no role in the study or in the decision to submit it. The study was not preregistered.

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The Sleep News provides general information, not personal medical advice. If sleep problems persist or affect safety, seek qualified medical care.

Forward this to a friend who sleeps badly.