Sleep & wake-up app — frequency-first design
Not a playlist. A frequency flow that helps you unwind into sleep.
NiceSleep combines binaural beats (left/right channel frequency difference) with an awake-to-sleep ramp, making it simple and low-stimulation to relax.
Note: NiceSleep is a wellness tool and not intended for medical use. If you have persistent sleep issues, please consult a qualified professional.
One-tap sleep flow
- Alpha Relaxation
- Theta Sleep onset
- Delta Drift in
- Automatic frequency ramp
- Smooth fade-in/out volume
- Black screen mode to reduce stimulation
Calm down when it's time to sleep. Perk up when it's time to wake.
Made for the daytime too: Focus / Boost, 10-minute boost and 40Hz activation (60 min) start with one tap. Results vary.
- Afternoon slump? Give yourself 10 minutes to wake up.
- Headphones on before work. Let the frequencies ease you into focus.
- Need a full block of focus? 40Hz activation (60 min), one tap away.
NiceSleep in 30 seconds
Put on headphones and see how a left/right frequency difference gently helps you unwind.
Made for calm, repeatable nights
NiceSleep is designed to be simple, repeatable, and low-stimulation. No technical terms required — pick a mode and press start.
A flow, not a playlist
A 3-stage flow (Alpha / Theta / Delta) that gently transitions you from awake to relaxed to sleepy.
Multiple sleep modes
Seven one-tap modes: Quick sleep, Calm mind, Deep sleep, Power nap, Focus / Boost, 10-minute boost and 40Hz activation (60 min).
Switch between binaural and monaural beats
Binaural plays a different tone in each ear and requires headphones. Monaural mixes both tones into both ears, so no headphones are needed; the phone speaker works.
Manual mode: dial in what feels right
Adjust the binaural difference (Delta, Theta, Alpha, Beta, Gamma), base frequency, background volume and countdown timer. Each wave type comes with a short explanation.
18 background sounds to choose from
Flowing water, rain, ocean waves, white noise, brown noise and spa music, plus our original pink noise and simulated rain. Volume is adjustable on its own, and sound keeps playing with the screen off.
Privacy-first
Health data is processed only on your phone and watch. It is never uploaded or used for ads. When a system permission is needed, we explain why and what it covers.
The science: how do frequencies help you relax?
Three charts explain NiceSleep's core: binaural frequency difference, brainwave bands, and the gradual flow from awake to asleep.
① Binaural Beats
② Brainwave bands
③ One-tap sleep ramp (illustrative)
Related research papers
Findings on binaural beats are mixed: some studies report benefits, others find no clear effect. We list both so you can judge for yourself.
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Auditory Beats in the Brain
A classic article explaining how a frequency difference between the ears produces the perception of a beat in the brain.
Read paper -
Human auditory steady state responses to binaural and monaural beats
A 40 Hz binaural beat evoked a measurable brain response, smaller than that of an acoustic beat in one ear, and undetectable above 3 kHz carrier tones.
Read paper -
Binaural Beat: A Failure to Enhance EEG Power and Emotional Arousal
Five beat frequencies, 3 minutes each: no significant changes in EEG power, heart rate or skin conductance, which does not support short listening as a way to enhance brain activity.
Read paper -
Efficacy of binaural auditory beats in cognition, anxiety, and pain perception: a meta-analysis
A meta-analysis of 22 studies (35 effect sizes) on memory, attention, anxiety and pain perception found an overall medium effect (g = 0.45). Longer listening and starting before a task worked better.
Read paper -
Minimal Effects of Binaural Auditory Beats for Subclinical Insomnia: A Randomized Double-Blind Controlled Study
A double-blind trial with 43 people with subclinical insomnia: two weeks of bedtime music with theta beats showed no significant difference in insomnia scores compared with music alone.
Read paper -
Binaural beats to entrain the brain? A systematic review of the effects of binaural beat stimulation on brain oscillatory activity, and the implications for psychological research and intervention
A review of 14 EEG studies: 5 supported brainwave entrainment, 8 contradicted it and 1 was mixed. Methods varied widely, so more standardized research is needed.
Read paper -
Music and binaural beat interventions for young adults: A systematic review of effects on anxiety, sleep, and cognition
A review of 10 trials in young adults (music, audiovisual stimulation and binaural beats): most improved at least one of anxiety, sleep or cognition (SMD 0.3–0.6), but samples were small and designs varied.
Read paper -
The effect of delta binaural beat on sleep onset and maintenance based on EEG signal analysis
An EEG study of 20 healthy students: delta beats did not shorten time to fall asleep, but N3 and REM time increased and awakenings decreased. The authors say further studies are needed.
Read paper
40 Hz and Alzheimer's disease research
Most of these studies use animal models or 40 Hz light-and-sound devices, which differ from this app's binaural beats. Listening to binaural beats has not been shown to prevent or treat Alzheimer's disease.
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Gamma frequency entrainment attenuates amyloid load and modifies microglia
In Alzheimer's model mice, 40 Hz light flicker reduced amyloid-β in the visual cortex and lowered plaque load in aged mice. This is an animal study.
Read paper -
Multi-sensory Gamma Stimulation Ameliorates Alzheimer's-Associated Pathology and Improves Cognition
Model mice heard 40 Hz tones 1 hour a day for 7 days: memory improved and amyloid fell in the auditory cortex and hippocampus. Combined sound and light reduced plaques more widely. This is an animal study.
Read paper -
Forty-hertz light stimulation does not entrain native gamma oscillations in Alzheimer's disease model mice
In two mouse models (APP/PS1 and 5xFAD), 40 Hz flicker did not engage native gamma oscillations in the visual cortex, entorhinal cortex or hippocampus, in contrast with earlier work.
Read paper -
Gamma frequency sensory stimulation in mild probable Alzheimer's dementia patients: Results of feasibility and pilot studies
A single-blind randomized pilot in 15 people with mild Alzheimer's: 1 hour of 40 Hz light and sound daily for 3 months, with less ventricular enlargement and hippocampal atrophy and better delayed face-name recall. The sample was small and not powered for these exploratory outcomes.
Read paper -
Safety, tolerability, and efficacy estimate of evoked gamma oscillation in mild to moderate Alzheimer's disease
A 6-month double-blind, sham-controlled trial in 76 people with mild to moderate disease: no significant difference on MADCOMS, CDR-SB or ADAS-Cog14. Decline in daily function, MMSE and whole-brain volume was nominally smaller, and treatment was well tolerated. It was not powered for efficacy, and most authors work for the device developer.
Read paper -
Influence of Binaural Beats Stimulation of Gamma Frequency over Memory Performance and EEG Spectral Density
30 healthy adults aged 18–33 listened to 40 Hz binaural beats embedded in music for 10 minutes: no significant differences in memory or EEG after correcting for multiple comparisons. Participants did not have Alzheimer's disease.
Read paper
These are summaries of academic literature, not clinical studies of NiceSleep, and do not mean you will get the same results with this app. NiceSleep is a relaxation tool, not a medical product.
How to use (it’s simple)
Get comfortable and choose how to listen
Binaural beats need separate left and right channels, so use headphones. Monaural beats need no headphones; the phone speaker works. A quiet room helps.
Pick a mode — or just press start
Pick a mode such as Quick sleep, Calm mind, Deep sleep, Power nap or Focus, choose a background sound and tap start.
Let the flow do the work
NiceSleep transitions stages and ramps frequency/volume automatically. Set your phone down (black screen mode helps).
Watch Alpha wave calibration (Apple Watch / Wear OS)
With an Apple Watch or Wear OS watch, finding the frequency that relaxes you most takes less effort. During Deep sleep, the watch also uses heart rate and movement to estimate when you fall asleep and adjusts the audio. Without a watch, Deep sleep plays on a fixed schedule.
What it does
- Reads live heart rate from your watch (permission required)
- Tests 9Hz, 10Hz, 11Hz (1 minute each)
- Recommends a frequency using relaxation indicators (e.g., lower average heart rate)
- For preference tuning only — not medical diagnosis
Before you start
- Wear your watch snugly in a quiet room
- Use headphones and relax with eyes closed for 3 minutes
- Allow heart rate access (HealthKit on iOS, watch sensor permission on Wear OS)
- No watch? You can still use manual listening
Calibration flow
Average heart rate (illustrative)
Note: watch data may sync with a delay, and results depend on how you feel at the time. Retest at different times to build a more stable preference.
Future hardware plans
NiceSleep plans to extend its frequency flow to pillows and Bluetooth accessories, and keeps deepening the watch experience for a more complete sleep ritual.
Smart pillow
Planned: combine pillow sensing with your bedtime flow so starting your ritual takes less effort.
Bluetooth accessories
Work with headphones and sensor accessories to simplify pairing, playback and status feedback.
Smartwatch
Apple Watch and Wear OS are supported, and we keep improving personalized frequency suggestions and bedtime pacing.
Download NiceSleep
Get it on the App Store for iPhone or on Google Play for Android phones.
FAQ
Do I need headphones?
Binaural beats require headphones because they rely on separate left and right channels. If you prefer not to wear them, switch to monaural beats and use the phone speaker.
Can I use it without a watch?
Yes. All audio modes work without a watch. Without one, Deep sleep plays on a fixed schedule, and manual mode lets you find a frequency you like.
Does NiceSleep upload my health data?
No. Health data such as heart rate and movement is processed only on your phone and watch and is never uploaded. Account and purchase records are stored on servers we manage; see the Privacy Policy.
Is this a medical treatment for insomnia?
No. NiceSleep is a wellness tool and doesn’t replace medical advice.
Which devices are supported?
iPhone via the App Store and Android phones via Google Play. A watch is optional: Apple Watch with iPhone, Wear OS with Android.
Support / Contact
If you have any questions, want to report a bug, or need help with subscription/payment, please contact us through the following channels.
Contact
- Email: admin@jxdtw.com
- Phone: 0922979050
We can help with
- Usage issues (playback/volume/modes/black screen, etc.)
- Apple Watch / Wear OS permissions and calibration
- Sign-in and account issues
- Subscription/payment questions and receipts
We typically reply within 1–2 business days (may vary with volume).