Rain running down a dark bedroom window with a single warm lamp reflected in the glass

Published September 22, 2026 · The Pocket Lofi Editorial Team · fact-checked against the sources below

The honest answer is that no sound reliably puts you to sleep, and the best evidence favors quiet music over noise. A 2022 Cochrane review found moderate-certainty evidence that listening to music improves subjective sleep quality. A 2021 systematic review rated the evidence for continuous noise as very low.

That is a less satisfying answer than the one most pages give, and it is the one worth having, because the gap between those two verdicts is the only thing in this subject that is actually decided. Everything else is preference, and preference is a real reason to pick something. It is just not the same thing as a finding.

Here is what each option has behind it.

What does the research say about noise as a sleep aid?

Less than its popularity suggests. In 2021, a team at the University of Pennsylvania’s Unit for Experimental Psychiatry published a systematic review in Sleep Medicine Reviews covering every study they could find on continuous white noise or similar broadband noise and sleep. Thirty-eight articles made it through screening. The studies disagreed with each other, and the disagreement went all the way to the extremes: some found continuous noise improved sleep, some found it disrupted sleep.

Their conclusion is worth quoting in its own terms. Graded against the GRADE criteria, the quality of evidence for continuous noise improving sleep was very low, which the authors note contradicts its widespread use. They also flagged that continuous noise may negatively affect sleep and hearing, and called for research with objective sleep measures before anyone promotes it further.

The Sleep Foundation’s own page on white noise lands in the same place from the other direction. It reports individual studies that look encouraging, including one where adults fell asleep 38 percent faster with white noise playing, and then says the mechanism is still unclear: researchers do not yet know whether white noise improves sleep directly or mainly works by masking unpredictable sounds from outside.

Masking is the part that is easy to believe and easy to test in your own bedroom. If a garbage truck at 5am is what wakes you, a steady sound that covers it is doing something real, whatever the reviews say about sleep onset.

Does music work better than noise?

On the current evidence, yes, with one important qualification.

The Cochrane review of listening to music for insomnia in adults was updated in 2022 and covers 13 randomized trials with 1,007 participants, who listened to prerecorded music for 25 to 60 minutes a night, over periods from three days to three months. Compared with no treatment, the music groups scored better on the Pittsburgh Sleep Quality Index, with moderate-certainty evidence and a difference of about one standard deviation. That is the strongest result anywhere in this subject.

The qualification is the part that usually gets dropped. Three of those studies also measured sleep objectively, and on those measures music may not have improved sleep onset, total sleep time, sleep efficiency or interruption. So what the review supports is that people with insomnia symptoms slept better in their own judgment, which is a genuine outcome and not the same as a change on a sleep tracker. No adverse events were reported in any of the included studies.

Notice the duration in the protocols: 25 to 60 minutes, not all night. That is closer to how a sleep timer works than to how a noise machine works.

What about white, pink and brown noise?

This is the point to say plainly what Pocket Lofi is. It plays original lofi and chillhop music in five stations, Focus, Rain, Sleep, Chill and Groove. It does not generate white, pink or brown noise, and it does not play binaural beats. If you came here specifically for a noise generator, this is not that app, and the honest thing is to say so before you download anything.

The three colors are worth understanding anyway, because most people arrive at this subject through them. White noise carries every audible frequency at roughly equal power, which is why the Sleep Foundation compares it to the static of an untuned radio. Brown noise puts far more power into the low frequencies and keeps the highs soft, which is why Cleveland Clinic’s explainer likens it to a waterfall, heavy rain or wind through trees. Pink noise sits between the two.

On evidence, Cleveland Clinic is blunter than most wellness coverage. The psychiatrist quoted in their brown noise article, Dr. Shivnaveen Bains, says the benefits of brown noise are still under research, that the research is minimal, and that there are no significant studies comparing brown noise to white or pink noise for ADHD. The article also cites a 2022 review of 34 studies that found no strong evidence supporting noise machines for sleep, alongside the 2020 review of 38 studies above.

If you want the full comparison, the guides here cover it properly: brown noise vs white noise, the noise colors overview, and pink noise for sleep. If what you actually wanted was rain, the Rain station is the nearest thing in the app, and it is recorded music rather than a generator.

So which sound should you pick tonight?

Work backward from what is waking you, not from which sound has the best reputation.

If the problem is outside noise, a neighbor, a road, a housemate on a different schedule, then you want masking, and the sound should be broad, steady and dull. Rain is the popular choice for a reason: it is dense enough to cover speech and boring enough to ignore.

If the problem is that your mind will not stop, the Cochrane result is the one that applies, and it points to quiet instrumental music rather than noise. Slow, unvarying, no lyrics, nothing you will want to listen to. Familiarity helps here. A track you have heard fifty times has nothing left to catch your attention on, which is the property you want at midnight.

If the problem is that you wake at 4am and cannot get back down, neither category has good evidence for you, and the reviews above are the reason to say that rather than to guess. Something quiet is still better than lying there doing arithmetic about how many hours are left.

And if you are choosing between two things you like equally, pick the one you will actually leave on. Adherence was one of the sources of heterogeneity the Penn review flagged across studies, which is a formal way of saying that people stop using sleep aids they find annoying.

How loud should it be, and should it run all night?

Quietly, and probably not.

The National Institute on Deafness and Other Communication Disorders puts the safe threshold plainly: sounds at or below 70 A-weighted decibels are unlikely to cause hearing loss even after long exposure, while long or repeated exposure at or above 85 dBA can cause it. The Sleep Foundation’s practical version of the same rule is to keep bedtime audio at about the volume of a background conversation or light rustling, and it notes that nearly 65 percent of infant white noise machines tested were capable of playing louder than recommended. Set it low enough that a voice in the next room would still get through.

On duration, the trials in the Cochrane review ran 25 to 60 minutes, not eight hours, and the Penn review’s caution about hearing applies to anything left on until morning. A timer that fades out after 30 or 45 minutes matches both the evidence and the hardware better than a sound that plays until your alarm does.

That is the shape Pocket Lofi is built around. The Sleep station is slow instrumental music written to be ignored, the sleep timer fades it out instead of cutting it, and background play with lock-screen controls means you can turn it down from the pillow without unlocking anything. It is a music player, not a sleep aid, and the research above is the reason that distinction is worth keeping.

None of this makes the decision for you. It just means that when you pick something tonight, you know which part is evidence and which part is preference, and there is nothing wrong with the second one. If you want the longer version of where this music came from and why it loops the way it does, the lofi guide picks up there.

Sources