The SomnoPose app cannot operate in the background or with the device in a “sleep” state, but there are several ways to save battery power.
On an iPhone, SomnoPose lets you greatly reduce power by using the proximity sensor to turn off screen illumination. While SomnoPose is recording data, an object brought close to the proximity sensor (near the earpiece) will cause the screen illumination to be turned off (and will also turn off the screen touch sensor). So if you place your iPhone in a holster or pocket, or otherwise cover the proximity sensor (maybe with a bit of tape), the screen will go blank, reducing power consumption.
Whether the screen backlight is on or not, all-night use of SomnoPose can use quite a bit of battery power (though normally only a fraction of a full charge). If you have trouble with power running out, consider one or more of these suggestions:
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