Reviewed: 25 October 2026
You are tired, the bedroom is quiet, and your mind decides this is the perfect moment to review every unfinished task. An advertisement promises a special audio track that will quiet your brain and send you to sleep within minutes.
There is a sensible idea here: sound can help some people relax. But claims about “retraining” the brain, replacing sleeping pills and achieving a 95% success rate deserve closer examination.
What are binaural beats?
Binaural beats are an auditory illusion. When each ear receives a slightly different tone—for example, 200 hertz in one ear and 205 in the other—the listener may perceive a beat corresponding to the five-hertz difference.
Stereo headphones are normally needed to deliver the separate tones. This differs from ordinary relaxing music or rain sounds, which can be played through a speaker.
The proposed mechanism is called brainwave entrainment: researchers investigate whether rhythmic sound can influence the brain’s electrical activity. However, perceiving a beat does not establish that the brain has entered a particular sleep stage.
A 2023 systematic review of 14 studies found inconsistent evidence for this mechanism: five studies supported entrainment, eight contradicted it and one produced mixed findings. The claim that binaural beats reliably guide the brain into deep sleep is therefore stronger than the evidence supports.[1]
What did the advertisement get right—and overstate?
The Health Horizon page is an advertorial promoting InnerFlo. It cites real research, but the connection between that research and the advertised product is often weak.
| Claim in the advertorial | What the evidence establishes |
|---|---|
| Stanford research supports the approach | A small study investigated a different system using customized audio and a SoundHealth headband. It does not establish that InnerFlo produces the same results. |
| MIT research backs the method | The cited MIT report concerns experimental 40-hertz sensory stimulation and brain health, especially Alzheimer’s research. It does not demonstrate that this app treats insomnia. |
| A 95% satisfaction or success rate | These are different measures. The two references attached to this section concern a small sleep pilot and anxiety during bronchoscopy; neither establishes a 95% insomnia treatment success rate for InnerFlo. |
| Effects within 15 minutes and sleep on the first night | Some listeners may relax quickly. The cited research does not establish this as a reliable outcome for buyers. |
The Stanford-linked announcement describes 20 people treated for four weeks, with 45% reaching an Insomnia Severity Index score below seven. This is encouraging preliminary evidence, but it comes from a small pilot involving another product. The announcement itself calls for larger studies.[2]
The MIT research is interesting in its own right. Borrowing its reputation does not bridge the gap between experimental sensory stimulation and a commercial sleep recording.[3]
The references presented also do not establish that normal YouTube or Spotify compression makes binaural tracks ineffective, or that the advertised service provides clinically superior “calibration.”
Can audio still help?
Yes. A useful relaxation aid does not need to deliver every benefit promised in an advertisement.
A Cochrane review included 13 trials with 1,007 participants. It found moderate-certainty evidence that listening to music improved self-reported sleep quality. Evidence for other outcomes was less certain, and objective sleep measurements did not show clear improvements.[4]
This supports trying calming music as an addition to a bedtime routine. It does not prove that binaural beats outperform ordinary music, or that either cures persistent insomnia.
One binaural-beat sleep pilot cited by the advertisement involved just 20 healthy students. They compared a baseline week with a week of listening, using sleep diaries. Improvements are worth studying, but this design cannot reliably separate the audio’s effect from expectations or other changes. It also cannot establish effectiveness in older adults with chronic insomnia.[5]
What about sleeping pills and melatonin?
The advertisement portrays sleep medicines as uniformly harmful and sound as the solution. Treatment decisions require more care.
Sleep medicines have different mechanisms, benefits and risks. Some can cause next-day drowsiness, confusion or dependence; these concerns deserve particular attention in older adults. A list of possible harms does not mean every medicine causes every problem, or that observational associations prove a medicine causes dementia.
Melatonin is not an established general treatment for chronic insomnia, but the advertisement’s blanket suggestion that it reduces restorative sleep is not established by the evidence reviewed here.
Discuss sleep medicines and supplements with your healthcare practitioner. Do not replace prescribed treatment with an audio subscription or abruptly stop a medicine that may require gradual withdrawal.[6]
A practical way to try calming audio
Choose a pleasant recording you already have access to, and listen quietly during your wind-down routine. A short session with a timer is a reasonable experiment, rather than a proven treatment dose.
Ordinary music can play through a speaker; genuine binaural playback needs separate stereo channels for each ear. Keep the volume comfortable, stop if the sound irritates you, and avoid turning bedtime into a test you must pass.
Notice how you feel over several nights: Are you calmer? Is sleep easier? Are you functioning better the next day? You do not need to monitor every minute or purchase an expensive plan to explore whether relaxing sound suits you.
When sleep needs more than a soundtrack
For persistent insomnia, cognitive behavioural therapy for insomnia—CBT-I—is the recommended first treatment. It addresses sleep-related worry, routines and the association between bed and wakefulness. It can be delivered in person or remotely.[6]
Regular waking times, a comfortable bedroom and avoiding caffeine and alcohol close to bedtime can also help. Alcohol may make you sleepy initially while disrupting sleep later.[6]
If poor sleep continues or affects daytime functioning, ask a healthcare practitioner to assess the cause. Audio can be a helpful comfort; it should not delay appropriate care.
Our view: calming sound is worth considering as an optional sleep aid. Binaural beats remain an area of research, and the evidence reviewed does not justify the advertorial’s strongest claims for InnerFlo.
This article provides general information and does not replace advice from a qualified healthcare practitioner.
Sources
- Ingendoh RM, Posny ES, Heine A. “Binaural beats to entrain the brain?” PLOS ONE (2023). https://doi.org/10.1371/journal.pone.0286023
- SoundHealth. “Acoustic Resonance Therapy Offers Promising Treatment
for Chronic Insomnia.” Company research announcement, 15 October 2024.
https://www.businesswire.com/news/home/20241015804508/en/Acoustic-Resonance-Therapy-Offers-Promising-Treatment-for-Chronic-Insomnia
Related publication: Lin et al., Journal of Sleep Medicine (2025), 22:26–31. https://www.e-jsm.org/journal/view.php?number=410 - MIT News. “Evidence that 40Hz gamma stimulation promotes brain health is expanding” (2025). https://news.mit.edu/2025/evidence-40hz-gamma-stimulation-promotes-brain-health-expanding-0314
- Jespersen et al. “Listening to music for insomnia in adults.” Cochrane (2022). https://www.cochrane.org/evidence/CD010459_music-insomnia-adults
- Dabiri et al. “The effect of auditory stimulation using delta
binaural beat for a better sleep and post-sleep mood: A pilot study”
(2022). https://pmc.ncbi.nlm.nih.gov/articles/PMC9125055/
The advertorial’s other reference alongside its 95% claim: Opartpunyasarn et al., anxiety during bronchoscopy (2022). https://pubmed.ncbi.nlm.nih.gov/35713444/ - US National Heart, Lung, and Blood Institute. “Insomnia: Treatment.” https://www.nhlbi.nih.gov/health/insomnia/treatment
Source checked: Health Horizon’s InnerFlo advertorial, accessed 25 October 2026. This review evaluates the claims and references presented on that page; it is not a comprehensive audit of every study or product document.