Have you been interested in monitoring your sleep, only to be repelled by the fact that you need a phone in your bed? Or an expensive hardware?
Sleep tracking has been known as a notoriously uncomfortable process, where you worry about hot phones under your pillow and cables twisted around your legs.
Over the last year, we have developed a way to put that all behind. A way to track movement at a distance — with ultrasound.
A sonar on your phone.
You don’t need any new hardware for that – everything is already in your smartphone. Microphone, speaker and a hell of a computing power. The only thing missing was the code. Not anymore.
Sleep as Android now uses your phone as sonar to contactlessly track your sleep.
With other sleep trackers, you need to have some device in your bed – a wearable or a smartphone. With Sleep as Android, you just put your phone on a nightstand and go to sleep. It will monitor your movement with the sonar.
And not only the movement!
At half a meter range, sonar is so accurate it can measure your breathing rate.
Sleep as Android can also measure your breathing at range with sonar.
What is this good for? People usually don’t have a clue whether they suffer from any nightly breathing disorder.
Sleep as Android will keep an eye (umm…ear actually) on your lungs and will show you in the morning how many times you have stopped breathing.
- Sonar emits sound that is on the edge of audible and inaudible sound (around 20 kHz). The frequency itself is perfectly safe for human hearing.
- The volume of the sound is maximally around 50 dB, which is less than the volume of a normal conversation. A refrigerator sound level is comparable.
- 1 meter away from the phone, the sound level can be compared to a pin falling to the ground
Ultrasound does not pose any threat to your health.
- Since the sound is so low, animals usually do not care about our sonar.
- On some devices you can hear audible artifacts during sonar tracking. Some of the signal gets into audible spectrum. This can be due to insufficient quality of the speaker, or some post processing which is applied to the audio output.
- Sonar won’t work with headphones, so it is not possible to listen to lullabies privately before sleeping.
How to try it?
- Download Sleep as Android app from Play Store.
- Start the app, go to Settings > Sleep tracking > Sensor and select Sonar.
- Let the app test your phone if sonar works for it.
- Start sleep tracking by tapping on the moon button in the main screen of Sleep as Android.
Please see the docs.