Fan sound for baby sleep

What this sound is

A fan sound has two components. The first is the broadband hum of motor and air flow, a continuous sound close to pink noise with the highs softened. The second is the faint, regular rhythm of the blades cutting the air; the ear barely registers it, but it gives the sound life and a mechanical familiarity. The card in the app says exactly that: steady hum with a soft blade rhythm. The sound is constant and runs for as long as you need, without the speed changes of a real fan. What wakes a baby is usually a sudden change in sound, not the sound itself, so a flat, predictable hum makes a good bed for sleep.

Why it may help

Parents discovering the fan is no accident: it does the same job as the noise family. The steady hum masks sudden household sounds, doors, kitchen, street, and resembles the continuous low environment of the womb. The faint blade rhythm feels more familiar and less artificial to some babies than a pure noise, because it is a sound they genuinely hear at home. On the evidence, we know of no study of fan sounds specifically, and the general evidence for steady sounds is weak and mixed. We cannot claim a fan sound puts every baby to sleep. Try it low for a few nights and see whether Agubu's sleep log shows a difference.

Safe use

Parents who put a real fan next to the cot rarely notice how loud it is; for the sound in the app, level and distance follow the white noise guide.

• Keep the volume low: the level recommended for hospital nurseries is about 50 decibels. The practical test is simple: if you can talk in a normal voice in the room and still be heard easily, the level is fine; if the sound drowns you out, it is too loud.
• Do not put the phone or speaker in the cot or on its edge. Keep it at least one to two metres away, and avoid headphones, sound toys attached to the cot and any speaker close to the baby's ear.
• Use the timer. Fading the sound out 20 to 30 minutes after your baby has fallen asleep is usually enough. If you leave it on through the night, keep the level genuinely low.
• Turn it down once your baby has settled, and do not let a loud setting become the habit even briefly. Do not leave it running all day while your baby is awake, because it masks the speech they learn from.
• Do not leave a real fan running while the phone plays the fan sound; two sources stacked raise the level without you noticing.

How to play it in Agubu

1. Open Agubu, go to the Sounds tab at the bottom and tap the Fan card under Household. This sound is part of the Premium library, so the card shows a Premium badge until you subscribe. The eight free sounds and the timer stay open to everyone. It plays on your device offline, with nothing to download.
2. Set the volume with your own ears first: if you can speak in a normal voice in the room and still be heard, it is low enough. Place the phone one to two metres from the cot.
3. Tap Timer and pick a duration. When it runs out the sound does not stop abruptly; it fades down slowly. Twenty to thirty minutes after your baby has fallen asleep is enough on most nights.
4. If you like, layer it in the Mixer: a low brown noise layer under the fan deepens the hum. The Mixer is a Premium feature and blends up to four sounds at separate levels. Sounds play without ads and the app needs no internet connection.

When to use it

• Through the night, for a baby who sleeps with a real fan at home, to keep the same sound when travelling.
• At nap time, low in the background, to mask the everyday sounds of the house.
• In the evening fussy hour while rocking, as a steady backdrop.