How does my phone, smart / fitness watch know when I sleep and when I wake up??
It measures heart rate and movement.
I have not tried them yet but my wife has and it seems to be close to accurate.
"Excluding the possibility that a female Scandinavian Olympian was running around outside our house last night, what else might be a possibility?"
If someone you know is afflicted with Dunning-Kruger, please help. #knowthecure
@mbull | instagram #imhardlyeverserious