This has been a feature of various Fitbit devices for a number of years, detecting your movement patterns through the night to determine your duration and quality of sleep - with
sleep phases recorded in the app.
Not exact matches
It will also
record the sounds you make during your
sleep and wake you up at the optimal time in your light
sleep phase.
In this study
phase, participants were asked to adhere to the
sleep hygiene protocol and use the actigraph wristband and
sleep journal to
record sleep information (see Figure 2).
The free tier includes a
sleep monitor that uses your phone or tablet's accelerometer to
record your
sleep quality, allowing you to track light and deep
sleep phases.
It also
records sleep patterns, showing different light or deep
phases, and telling you if you've had a rough night.