How long should you leave white noise on at night?

Thirty minutes to an hour is enough for most sleepers, since falling asleep usually takes under twenty minutes. Continuous playback is only justified if you wake in the night, or if the noise bothering you lasts until morning.

Is it bad to sleep with white noise all night?

The thing to watch is volume, not duration: a low level, well below a conversation, and speakers rather than in-ear headphones for a whole night.

Why do I wake up when the sound stops?

Because the brain reacts to change rather than to sound level: a sudden stop is an event. A fade-out over the last few minutes removes the event.

How long should a sound play at night?

Most people fall asleep within the first twenty minutes. Playing for eight hours is therefore useful in one specific case — and costly in all the others.

What the duration really changes

An ambient sound serves two distinct moments: falling asleep, where it occupies your attention and masks a household that is still awake, and waking in the night, where it stops the silence of three in the morning from becoming a space to fill with thoughts.

If you do not wake in the night, the sound has nothing left to do once you are asleep: it drains the battery, it warms the phone under the pillow, and it takes away a silence your deep sleep has no need to see replaced.

15 to 20 minutes

for a nap

The length of a nap that works, and the one that stops you taking a ninety-minute one you wake up more tired from. The sound stops before deep sleep.

Set it before lying down, not after.

30 minutes to 1 hour

the default setting

Covers falling asleep with room to spare on difficult evenings, and stops before the middle of the night. This is the choice that suits most people on most nights.

If you only remember one, remember this one.

Endless

night waking, or constant noise

Justified in two situations: you regularly wake around three or four, or the noise that bothers you lasts all night — a busy street, a flatmate on shifted hours.

At low volume, and plugged in.

Why a hard stop wakes you

The brain does not monitor sound level, it monitors change. A sound that stops dead is a clear change, exactly like a door slamming — and it arrives at the worst moment, while sleep is still light.

A fade-out removes the event: over the last five minutes the volume drops slowly enough that no instant stands out from the one before. You do not hear it stop, which is the only result that counts.

It is also why showing a countdown on screen is a bad idea. Knowing there are twelve minutes left gives you something to watch, and watching keeps you awake.

A mix that holds up all night

ENDLESS, AT LOW VOLUME

Brown noise

Light rain

Two layers are enough, and the volume matters more than the choice: over eight hours, a pleasant sound at a medium level becomes fatigue. Set it low enough that you doubt you can hear it.

The timer is in the free version

From 15 minutes to 1 hour 30 or endless, with the fade-out, without paying anything. The default is chosen once and for all in the settings.

See the app