This is cool, but it'd be nice if they had evaluated Apple Watch, which is far more common than the devices they measured for. I've been tracking sleep for year

This is cool, but it'd be nice if they had evaluated Apple Watch, which is far more common than the devices they measured for. I've been tracking sleep for years with mine. My sense is that it's pretty accurate, but the problem is, I'm asleep during the time in which I could attempt to verify this! ;)