How loud should a session be?

Most pages in this category will tell you about frequencies. Almost none will tell you the thing that could actually harm you, which is level and duration.

The trade that matters

Noise-induced hearing loss depends on both intensity and exposure time, and the relationship is not linear — a small increase in level buys a large reduction in the safe duration.

The widely used public-health guidance puts sustained exposure around 80 dB at roughly 40 hours a week before risk accumulates meaningfully. Every few decibels above that roughly halves the tolerable time. By the time you are at typical "enjoyable music" levels on headphones, the safe daily budget is measured in tens of minutes rather than hours.

This use case is unusually exposed to that arithmetic. Someone running a 30-minute focus session three times a day, five days a week, is accumulating serious duration. If the level is set by what feels pleasant, the total exposure can be substantial without ever feeling loud.

The damage is painless while it happens, cumulative across years, and permanent. There is no recovery phase.

What the level should be

For these sessions specifically, the target is much lower than most people set.

A session should sit at or just above the threshold where you have to attend to hear it. If you are sitting still in a quiet room and it is comfortably, obviously present, it is louder than it needs to be.

That is not an aesthetic preference. A generated field is doing masking, boundary-marking and — arguably — rhythmic work. None of those require volume. A rhythm delivered quietly is still delivered.

For sleep the rule is stricter again. Audio that is clearly audible while you lie still is loud enough to produce arousals you never consciously register, which is one of the plausible mechanisms by which sound worsens sleep rather than helping it. Using sound to fall asleep covers the timing side of the same problem.

Three checks you can do without a meter

The conversation check. You should be able to hold a normal conversation over the session without raising your voice or removing headphones. If you cannot, turn it down.

The ring check. Any ringing, fullness or dullness after a session means it was too loud, too long, or both. That is a warning, not a curiosity.

The creep check. If you find yourself raising the level over a long session, that is adaptation, not the session getting quieter. Turning it up chases a moving target and loses. Take a break instead.

Most phones will also show you an exposure estimate in their health or sound settings. Worth looking at once, honestly, before deciding you are careful.

Why noise beds deserve extra caution

Broadband noise is deceptive. It has no melody, no transients and no dynamics, so it does not feel loud in the way music does — and it is easy to set it higher than you would set music without noticing.

It is also usually the component people raise when a room gets noisier, which is exactly the wrong response. If the room is loud, the answer is isolation or a different room, not more level. Sound masking or silence? sets out what masking actually needs, which is far less than most people give it.

Practical settings

Start every session lower than feels right and leave it there for five minutes before judging. Adaptation works in your favour.

Use a session that ends. A defined block limits exposure by construction; an endless stream does not. Every session in this catalog has a length.

For sleep, use a speaker across the room and a short sleep timer. Delta Sleep Gateway at 27 minutes on a quiet speaker is the shape to aim for.

For long focus blocks, take the headphones off between sessions rather than running continuously. Sensorimotor Calm Focus at 19 minutes is a reasonable unit.