Nightsongnightsong.app · Quick Step · TestFlight · Sep 2026

Your phone has a new night job.

Plug it in. It starts when you settle. In the morning you get one honest number: your Somnus Index, measured against you and nobody else.

A person plugging in the phone on the nightstand at night
01
Plug in
Nightstand or mattress edge, within a few feet of your head.
A person tapping the orange Start button on the phone
02
It starts
Tap the terracotta Start orb at the bottom of Home. After a night or two, turn Auto-start on and it starts when you settle.
A person asleep, the phone glowing on the nightstand
03
Sleep
Lock the phone and forget it. It is listening, and it is not telling.
A person in morning light glancing at the phone
04
Glance
It stops in the morning, or when you get up and walk away. Your Somnus Index™, snore burden and breathing regularity, measured against you, is waiting on Home.

You own your night. Thank you for trusting us with something this personal. A phone listening to you sleep is a real act of trust, and we treat it that way. Your recordings stay on your phone unless you choose to send them. The listening, the math, and your morning number all happen on the device in your hand, and the number is you against your own baseline, nobody else’s. Your night, your data, your call. Sharing is opt-in: if you choose to share, we get a summary of a few numbers, with no name attached. Never a recording. Never your name. And if anything is confusing, tell us. We read every note.

Matt
Somnus Technologies

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Before night one: get the app

  1. Get the free TestFlight app from the App Store (search “TestFlight”).
  2. Open the public join link on your iPhone: testflight.apple.com/join/2tkCUF1M
  3. In TestFlight, tap Accept, then Install. Nightsong appears on your Home Screen like any other app. Open it from there from now on.
  4. Updates. When we ship a new build, TestFlight sends a note. Open TestFlight and tap Update. Your nights and your baseline stay put.

If TestFlight asks you to install first, install it, then open the link again. Rare fallback: an email invite from Apple’s TestFlight works too, but the public link is the way in.

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First open: two screens worth reading

  1. A few quick yeses. Mic (only while a night is running). Optional Apple Health (reads only, never writes). Confirm you’re 18+. Privacy Policy and Consumer Health Data Privacy Policy are one tap away, and they’re short.
  2. Sharing with Nightsong. Two buttons: Share & help improve Nightsong or Not now, keep it fully private. Confirm you’re 18+. Policies are one tap away. Share sends a summary of a few numbers from your night’s sleep, with no name attached. Never audio. Never your name. Change it any time under You.
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Screen one: Sharing with Nightsong

Sharing choice screen: Sharing with Nightsong, the one-sentence consent, and the Share and help improve Nightsong button 1 2
  1. You will see this screen during first open. If you already tapped past it, open the You tab (the person icon at the bottom of Home), scroll to About, and tap Sharing choice. It shows the date you accepted.
  2. Read the one sentence in the box. It says what sharing means, in plain words. Confirm you are 18 or older when asked.
  3. Tap the terracotta button: Share & help improve Nightsong. That is it. You are done.
  4. Changed your mind later? Same place under You. Tap Not now, keep it fully private and sharing stops.
What this sends. After the phone makes your Somnus Index, a summary of a few numbers from that night’s sleep, with no name attached goes to us. Never audio. Never your name. It is how the app gets better for the next person, and for you.

Rendered from the app, so every word and button matches what you will see on your phone.

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Screen two: Therapy & context

  1. Open the You tab. It is the person icon in the pill at the bottom of Home.
  2. Tap Therapy & context. It is the first row, under “Your context & settings.”
  3. Tap the circle next to what you use: CPAP, Oral appliance, or Nerve stimulator (HGNS or similar).
  4. Track my usage: switch it on. Nightsong asks one quick question in the morning. It is stored on this phone.
  5. Using something not listed? Tap Something else. Using nothing? Leave the screen blank; the app works exactly the same.
Why we ask. This never changes your score. It tells us what people are really using alongside their nights.
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How your night runs

Plug in, tap Start, sleep. In the morning, tap stop, then tap how you slept, scroll all the way down, tap Done. Forgot to tap stop? Move around for about five minutes, or open Nightsong, and it ends on its own. Home shows one number: your Somnus Index. Snore burden and breathing regularity, measured against you. That’s the meaning. Do it by hand for the first night or two, then turn Auto-start on (/0.8) and the night runs itself.

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Tonight, a little more detail

  1. Placement is the whole game.
    • Plug in. Nightstand or mattress edge, within a few feet of your head.
    • Keep the microphone clear of pillows and blankets.
    • Fans and noise machines belong at the foot of the bed or across the room, not next to the phone.
    • Pick one spot and keep it. Same spot, every night, is what makes your baseline yours.
  2. Start. Tap Start. Don’t force-quit Nightsong at bedtime. In the morning, tap stop. Start and stop it yourself for the first night or two; after that, turn Auto-start on (/0.8) and it does both. Forgot to tap stop? No problem. Get up and move around for about five minutes, or just open Nightsong, and the night ends on its own.
  3. Leave it be. Lock the phone and sleep. Don’t run video on that phone overnight. It has a job to do.
  4. Do Not Disturb or airplane mode: optional, not required. Nightsong keeps listening through the night either way. A call or an alert just makes the night a little noisier. Turn one on for a cleaner night.
Listening screen: Reading your night. The recording stays on your phone.
Listening. Reading your night. The recording stays on your phone.
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Tomorrow morning, three taps to Home

The morning reveal: an orange orb inside a ring, showing your Somnus Index
The morning reveal. Do not stop here.
  1. Tap how you slept. Groggy or not. One tap.
  2. Scroll all the way to the bottom.
  3. Tap Done. That is the only way out to Home. If you stop on the orb, you never get there.
Home: Somnus Index 81, Steady, cards for Breathing, Snore and Sleep, and one short line about the night
Home. Index 81, Steady. Your baseline, not a stranger’s average.

Home is where you live. Your Index sits at the top with one plain word. Three cards under it: Breathing, Snore, Sleep, each against your own history. Under the cards, one short line about the night.

Tap the big number for the deeper dive. Tap Snore to review it and listen to your loudest moments. Breathing and Sleep are there too.

Your Somnus Index™ is real, and it is made on your phone in the morning when you wake up. A large share of it is snore burden and breathing regularity. Other sleep measurements are in there too, but a much smaller portion. It is measured against you and builds a personal baseline over time, not Apple Health or Oura readiness. Rings and watches score readiness, movement, and heart rate. Nightsong is listening to your night. That is why the number will feel different from Apple Health, Oura, or Garmin-style scores, by design.

How it is made: 60 held-out sleep-lab recordings, from an outside library of 287 expert-labeled overnight recordings. Every engine change is checked against them; none are used to train or tune it. Plain, fixed checks throw out anything not loud enough or steady enough to be real. If the night was not clearly heard, you get no number instead of a guess.

Steady means a solid night, for you. Strong means a better night than your usual.

Don’t chase the number. It’s not a grade. It’s a mirror.

Your Night: Breathing, Snore, Sleep and Vitals cards, then Loudest Moments
Tap the big number. Cards, then your loudest moments.
Home while learning: LEARNING, Still learning your baseline, 0 of 7 nights, no reading last night on each card
Learning. Normal for the first nights.

Seeing LEARNING, “Still learning your baseline,” or “0 of 7 nights”? Normal. Not broken. It takes a couple of nights. Keep running nights the same way: same spot, plugged in. Dashes or “no reading last night”? Check placement (closer to your head, mic uncovered, fan across the room), then try another night.

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Screen three: Set this up once

After your first night or two, open the You tab, then Settings & trust. Turn these on and leave them on. From then on the night arms itself and the morning is gentler. Noticed reminders lives here too: when a night moves off your own baseline, Home says so in one short line. You versus you, never a verdict.

Settings and trust: Night capture with the nightly start reminder, Noticed reminders when a night moves off your own baseline, then the Auto-start row
Settings & trust. Nightly reminder, Noticed reminders, then Auto-start and Smart wake.
Auto-start: Set this up once, with Auto-start nights, At my bedtime and When plugged in around bedtime all on
Auto-start: all three on. Set your bedtime.
Smart wake on: a gentle wake by 6:00, sound and haptic ramp from a lighter phase
Smart wake: on. Pick your up-by time, tap Set wake.

Side bonus. Under You there is a quiet target for steps or active minutes, measured against your own days. Set it once if you want it.

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Quick answers

Do I need internet?
Not for listening or scoring. The night runs on the phone.
Will it eat my battery?
Keep it plugged in. That is the normal setup.
Is it recording everything?
It listens for sleep sound on the phone. Your recordings stay on your phone unless you choose to send them.
What about Watch heart rate or oxygen?
Heart rate, HRV, and oxygen come from Apple Health when a Watch is connected. Nightsong does not measure those with the mic. The Index is still mostly snore burden and breathing regularity from the phone.
Is this medical?
No. The note at the bottom of this page says who it is not for.
Forgot to start?
No Index for that night. Next time, tap Start, and turn Auto-start on so the night arms itself. Don’t force-quit Nightsong at bedtime.
What is the sparkle?
Ask. Tap it on Your Night or You to ask about your night. Answers come from your own nights, on your phone.
It says it didn’t hear the night?
Placement. Closer to your head, mic uncovered, fan across the room. Nightsong would rather say nothing than guess.

See something odd? Show us. Take a screenshot, tap the thumbnail, choose Share Beta Feedback. TestFlight sends it straight to us. Or write to [email protected]. Privacy questions: [email protected]. Everything else: nightsong.app/contact. We read all of it, usually the same day.