YMMV but my vivosmart 3 is useless at sleep tracking. I read in bed, and my heart rate goes down while i'm doing this and the thing invariably thinks i'm sleeping, messing up the stats.
There's only so much that can be done with a motion sensor and heart rate data. Personally I try to burn the candle enough that if I'm in bed I should really be sleeping. I can read on a couch with a cat.
If you are going to be reading in bed and want better sleep detection, try using the hand with the watch for page turning, or if it's a device and you just tap to turn pages try holding it with your watch hand. Just that motion may be enough for it.
If you are going to be reading in bed and want better sleep detection, try using the hand with the watch for page turning, or if it's a device and you just tap to turn pages try holding it with your watch hand. Just that motion may be enough for it.