Delta · 1 Hz
1 Hz beat
A very slow beat for the deepest part of sleep.
Some evidence · headphones
Sounds for sleep
Low, slow sound for winding down. Delta-range tones and gentle noise that fade into the background while you settle. Set a sleep timer and let it go quiet on its own.
Sounds in this collection
Delta · 2 Hz
2 Hz beat
A slow delta beat to settle toward sleep.
Some evidence · headphones
An even hiss that covers distractions.
Backed by research
A softer, balanced noise often used for sleep.
Some evidence
A deep, low rumble many find good for focus.
Some evidence
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