Drift Off · Theta to Delta
The beat glides from 8 Hz to 2 Hz over 20 minutes over soft brown noise.
Do not listen while driving or operating machinery.
How is it made?
- Binaural · Left 176 Hz · Right 184 Hz · Beat 8 Hz (Alpha)
- Brown noise
- Beat → 2 Hz over 20 min
Sound is generated on this device in real time; no files are downloaded from a server. There is a 10 s fade-in at the start and a 10 min fade-out at the end.
Evidence
C · Preliminary/mixed evidenceSmall trials or pilot studies; inconsistent results.
Helps mask surrounding sounds.
Evidence level B: Moderate evidence- What do we know?
- Auditory masking is an established psychoacoustic phenomenon: a steady sound raises the detection threshold of other sounds in similar frequency bands. This is why noise is used to cover ambient sounds.
- What don't we know?
- It is not clear that masking translates into protected sleep: in a 25-person lab study, adding pink noise to intermittent environmental noise worsened sleep structure further, and earplugs worked better. A systematic review warns that continuous noise may also affect hearing.
Research on sleep is at an early stage; there are small pilot studies.
Evidence level C: Preliminary/mixed evidence- What do we know?
- Two small pilot studies reported positive results: in an uncontrolled study, the sleep diaries of 20 students improved; in a 10-person lab study, binaural beats with a varying beat difference shortened the time to fall asleep.
- What don't we know?
- Comparison conditions are weak (no control or a silent night) and samples are very small. A systematic review of music and binaural beats in young adults could not run a meta-analysis because studies were heterogeneous; small samples further limit certainty. In a home study of 221 people, binaural, monaural and beat-free monotonous sounds made no difference to sleep latency.
A session's level is the weakest of its linked claims; it is never raised by a strong but unrelated claim.
Keep your device volume comfortable, preferably below 60%. You can also use your device's headphone-safety settings.