I had always wondered that. I once noticed that during my one night where I was not tired at all and was up all night laying in bed that it didn't change it's number until about 5 am when my watch thought I was sleeping. But I had noticed other times that whatever time I'd wakeup it would be showing the -- no matter the time I wake. 3am, 4 am, 5 am, etc. So, I just wondered when it does it?
