Sound for sleep: noise, nature sounds, binaural
What is known?
In some studies sleep-quality scores improved with white noise, but much of the evidence comes from special settings. A systematic review rated the evidence quality as very low and warned that continuous noise may harm sleep and hearing. In one laboratory study pink noise reduced REM sleep over a night.
Practical tips
Keep the volume below conversation level and put the source away from your head. Sessions that play while you fall asleep and then fade out gently (e.g. 30-60 minutes) put less load on your hearing than sound that plays all night. Wearing headphones all night can irritate the ear canal.
Frekans Studio's sleep sessions start with a fade-in and end with a long fade-out; in sleep mode the screen dims and there are no visuals.
What does the evidence say?
Evidence on sleep is low quality and mixed; in one study pink noise reduced REM sleep. Keep the volume low.
▲ C · Preliminary/mixed evidence- What do we know?
- A meta-analysis of 12 randomized trials of white noise found better sleep-quality scores in adults and older adults; much of the evidence comes from intensive-care patients and infants. In a review of 34 studies, 19 reported positive results (only 6 of 18 for white noise). A 2025 systematic review of 7 randomised trials in hospitalised adults found white noise improved sleep efficiency and was well tolerated; the studies were small and varied, so no meta-analysis was possible.
- What don't we know?
- A systematic review of 38 studies rated the evidence 'very low' quality and warned that continuous noise may harm sleep and hearing. In a 25-person lab study, pink noise (50 dBA) reduced REM sleep by 18.6 minutes in one night. Some infant sleep machines were measured reaching hazardous levels at maximum volume.
Research on sleep is at an early stage; there are small pilot studies.
▲ 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.
Helps mask surrounding sounds.
◆ 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.
Evidence levels and sources come from the database; the article adds no new claims. Evidence methodology
Frequently asked questions
- Earplugs or noise?
- In one laboratory study, earplugs did better than pink noise under intermittent noise. Which suits you depends on your environment.
- Can I use it for sleeping problems?
- Frekans Studio is not a medical device. For long-lasting sleep problems, see a health professional.
Listen and try
Last updated: 1 October 2026 · This article is for information only; it is not medical advice.