Sleep onset is the drift from wakefulness into light sleep. Low delta frequencies around 2 Hz are used to set a slow, steady rhythm for that transition.
What the research on 2 Hz binaural beats shows
In a crossover study of 10 people, a beat that varied between 0 and 3 Hz shortened sleep latency, the time to fall asleep, compared with silence 1. In a sleep-lab study, a 3 Hz beat helped people reach deep sleep sooner 2.
Longer-term pilots of delta beats report lower anxiety and better quality of life, but without control groups 3. In a small tinnitus study, delta beats reduced distress, anxiety and depression scores more than white noise 4.
How to use 2 Hz
Use 2 Hz with the lights off as you settle in, then let a sleep timer fade it out. Pair it with brown noise if your room is noisy.
How to listen
- Use headphones for binaural beats. Each ear needs its own tone. Isochronic tones work on speakers.
- Start before the task. A meta-analysis found that listening before (or before and during) a task worked better than listening only during it, and that longer sessions helped.
- Keep the volume low. The beat works at a comfortable, quiet level. Louder is not better.
- One goal at a time. Studies tested one beat frequency at a time. You can layer sounds in Neuro Gardens, but there is no evidence that stacked frequencies add up.
About the evidence
Binaural-beat research is promising but uneven. Studies are often small and use different settings, and a 2023 systematic review found that only 5 of 14 EEG studies showed the brain following the beat frequency (Ingendoh 2023). We rate each frequency honestly, link every study to PubMed, and update these pages as new research is published.
Frequently asked questions
Do binaural beats help you fall asleep faster?
A small crossover study found that 0–3 Hz beats shortened time to fall asleep compared with silence. Larger trials are needed.
What is the difference between 2 Hz and 3 Hz for sleep?
Both are delta frequencies. Neuro Gardens uses 2 Hz for falling asleep and 3 Hz for staying in deep sleep, following the sleep stage each was studied in.
Studies cited
All studies link to PubMed, run by the National Library of Medicine at the U.S. National Institutes of Health (NIH).
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Lee HA, Lee WJ, Kim SU, et al. · SLEEP · PMID 38629490
A beat that varied between 0 and 3 Hz shortened the time to fall asleep compared with silence and changed heart-rate variability around sleep onset. One author was affiliated with LG Electronics.
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A novel insight of effects of a 3-Hz binaural beat on sleep stages during sleep
Jirakittayakorn N, Wongsawat Y · Frontiers in Human Neuroscience · PMID 30319382
Played from the start of stage N2 sleep, a 3 Hz beat lengthened deep N3 sleep, shortened N2 and helped people reach N3 sooner than a silent sham.
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Binaural beat technology in humans: a pilot study to assess psychologic and physiologic effects
Wahbeh H, Calabrese C, Zwickey H · Journal of Alternative and Complementary Medicine · PMID 17309374
After 60 days of daily listening to delta (0–4 Hz) beats, trait anxiety fell and quality of life rose. With no control group, the authors call for a larger randomized trial.
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Prakash P, Konadath S · European Archives of Oto-Rhino-Laryngology · PMID 38641736
After 30 days of 20-minute sessions, both delta beats and white noise reduced tinnitus distress, anxiety and depression, with larger reductions in the delta group.
Try 2 Hz in Neuro Gardens
Pick Sleep Induction on the outcome wheel, choose music from ambient, jazz, lo-fi, classical or nature, and press play. Audio keeps going with your screen locked.
Get notified at launchNeuro Gardens is a general wellness app, not a medical device, and is not intended to diagnose, treat, cure or prevent any disease. Studies cited here are research on binaural beats in general, not tests of Neuro Gardens. Never listen to low frequencies while driving.