Bedrooms that are too bright, too hot or too noisy are linked to worse sleep and recovery in young adults, but not to shorter sleep, according to a study published in the journal Sleep Health. Researchers led by Adwoa Dadzie, a doctoral candidate in biobehavioral health at Penn State, followed 372 young adults with an average age of 22 for 14 consecutive days. Participants filled in a daily diary recording how bright, hot, cold or noisy their sleeping area had been, and wore a wrist actigraph that logged how long they took to fall asleep, how long they slept and how often they woke. Penn State published the findings on 30 September 2026. The work was funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development under grant R01HD073352-10, with further support from a private foundation consortium.
What the sensors recorded
On nights participants described as too bright, they took longer to fall asleep, rated their sleep worse and spent more time awake. Nights rated too hot or too noisy also scored worse on both the participants’ own ratings and the wrist sensor data. Nights rated too cold showed no effect the objective data could detect. Total sleep duration stayed broadly unchanged throughout. The authors flag two limits. They measured how participants perceived brightness, heat and noise rather than recording decibels, lumens or degrees, and they say further research is needed to explain why quality fell while duration held.
What this means in practice
The sample was US young adults averaging 22 years old, so the findings do not automatically carry across to older adults. The study also tracked sleep over two weeks rather than long-term health. Dadzie and co-author Orfeu Buxton, professor of biobehavioral health at Penn State, suggested earplugs, noise-cancelling devices, sleep masks or blackout curtains for people with little control over their surroundings. That is the researchers’ suggestion, reported here as theirs, and every part of it concerns the room rather than anything taken by mouth.
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Perqen stocks food supplements, not bedroom fittings, so nothing in this study points at a product. Perqen membership costs £4.99 a month or £29.99 a year and applies member pricing across the whole 1,393-product catalogue from established brands.
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