Experiment guides → Bedroom & environment → Earplugs

Do earplugs improve sleep?

A 14-day self-experiment guide · Last updated September 5, 2026

Quick answer: if your bedroom has noise you can name, probably. The key fact from noise research is that sounds fragment sleep without waking you: passing traffic or a partner's cough triggers brief arousals and heart-rate spikes that you don't remember but that lighten the night. In a simulated intensive-care environment, earplugs and eye masks together restored REM sleep, cut arousals and raised melatonin. There's no large trial of earplugs in ordinary bedrooms, so the size of the benefit for you is unknown — but foam plugs cost almost nothing, and 14 nights against a baseline will tell you whether your sleep was being chipped away by sounds you never noticed.

"I will sleep with earplugs for 14 nights."

What the research says

Noise disturbs sleep below the threshold of waking. Basner and colleagues' review in The Lancet summarises decades of sleep-lab and field studies: environmental noise causes awakenings, but far more often it causes arousals, sleep-stage shifts and autonomic responses — heart rate, blood pressure — that don't reach awareness. People habituate to waking from noise, but the cardiovascular responses persist for years. Sleep can feel fine and still be fragmented (Basner et al., 2014).

Earplugs and eye masks in a simulated ICU: more REM, more melatonin. Hu and colleagues had healthy volunteers sleep in a lab reproducing ICU noise and light, with and without earplugs and eye masks. With them, participants had more REM sleep, reached REM sooner, woke less, and had higher urinary melatonin. It's an extreme environment — but a direct demonstration that blocking sound and light changes the structure of sleep, not just the feel of it (Hu et al., 2010).

In real ICU patients, subjective sleep improved. The same group later randomised 50 ICU patients to earplugs, eye masks and relaxing music, or usual care. The intervention group reported better sleep quality and had higher melatonin levels. Hospital settings again, but the same tools — and the reason earplugs are now standard in ICU sleep-promotion bundles (Hu et al., 2015).

What this evidence doesn't say

The controlled studies are in intensive-care conditions — far louder and brighter than a bedroom. No good trial of earplugs alone in ordinary homes exists, and in the ICU studies earplugs were paired with eye masks, so their separate contribution isn't isolated. If your bedroom is genuinely quiet, there may be nothing to block.

Run it as an experiment

  1. Baseline five nights, with a sound diary. The usual three ratings, plus what you noticed: traffic, snoring, a fridge, birds at 5 AM. If the list is empty, consider the cooler-bedroom or screens experiment instead.
  2. Choose plugs you can actually sleep in. Soft foam with a high attenuation rating for most people; silicone putty or wax if you're a side sleeper and foam presses. Try them for an evening on the sofa first — comfort decides adherence.
  3. Make the pact. "I will sleep with earplugs for 14 nights." Check you can still hear your alarm and a smoke alarm — test it before night one.
  4. Morning check-ins, plus two notes. Did they stay in? Did you wake with sore ears? Both are common in the first nights and usually settle. If plugs come out by morning, it may still have covered the sleep-onset window that matters most.
  5. Compare restedness and wakings. Feeling more rested on the same hours of sleep is the signature of less fragmentation. If nothing changed, noise wasn't your problem — good to know before buying a white-noise machine.
Want this structured for you? Run it in N of 1 — baseline nights, morning check-ins and an honest result, ready to go. Your first experiment is free.

What to expect

The typical positive result isn't "I slept longer" but "I woke feeling more rested" — the sign that arousals you never noticed have stopped. It can take three or four nights to get used to the sensation and to hearing your own heartbeat. A minority find plugs make them more alert to internal sounds, or irritate the ear canal; that's a valid negative result.

Who should skip this

Don't use earplugs if you're the only adult responsible for a baby or a dependent who may need you in the night, or if you have an ear infection or a perforated eardrum. Clean or replace plugs regularly — foam plugs are single-use or few-use, and wax build-up is a real side effect of nightly plugs; if your ears feel blocked by day, stop and see a pharmacist.

Frequently asked questions

Is it bad to sleep with earplugs every night?

For most adults, no, with two caveats: hygiene (replace foam plugs often, keep silicone ones clean) and wax build-up, which nightly plugs can push deeper. If you notice muffled hearing by day, take a break. The other consideration is safety — hearing an alarm or a child.

Which earplugs are best for sleeping on your side?

Ones that don't protrude: mouldable silicone or wax that sits flush in the ear, or low-profile foam. Full-size foam plugs work brilliantly on the back and press painfully on the side. Comfort is the whole game for a 14-night test.

Earplugs or white noise for a noisy bedroom?

Earplugs remove sound; white noise hides it. Earplugs are cheaper, drug-free in every sense, and don't risk lightening sleep the way continuous sound might. Test earplugs first; if you can't tolerate them, white noise is the alternative experiment.

Related experiments

Does white noise help you sleep? · Does sleeping in total darkness improve sleep? · Do you sleep better in a cold room?

Sources

  1. Basner M, Babisch W, Davis A, et al. Auditory and non-auditory effects of noise on health. Lancet. 2014;383(9925):1325–1332. PubMed 24183105
  2. Hu RF, Jiang XY, Zeng YM, et al. Effects of earplugs and eye masks on nocturnal sleep, melatonin and cortisol in a simulated intensive care unit environment. Crit Care. 2010;14(2):R66. PubMed 20398302
  3. Hu RF, Jiang XY, Hegadoren KM, Zhang YH. Effects of earplugs and eye masks combined with relaxing music on sleep, melatonin and cortisol levels in ICU patients: a randomized controlled trial. Crit Care. 2015;19:115. PubMed 25881268

Track this experiment in N of 1

A few baseline nights, then the change — and your own mornings deliver the result. No streaks, no guilt. Your first experiment is free.

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This page is general information about published research, not medical advice. If you have a sleep disorder, are pregnant, or take medication, talk to your doctor before changing your routine.