I am giving up on my FB and will be switching to a 645 as I like the functions much better for running. However, I will be using the 645 and perhaps vivosmart hr at night to track sleeping hr and sleep.I just wonder how the two devices track sleep. On the FB, I do not enter times I go to sleep or when I wake. The FB does something to measure total sleep and sleep stages. Is this the same way on Garmin or do I have to enter sleep times and the 645 (and vivosmarthr) only track sleep when I am between those times?
I am going to switch to FR645M this week from Fitbit Charge 2 too.
From what I have already understood, the sleep tracking is not so deep as is on fitbit, but it is still automatic, but I have read sth about inacuracy. May be some users will know.
I guess, there is no reason to have two devices from Garmin. FR645 should be enough. So if you will be conformatble with FR645, there is no reason to buy another device (I would say).
I always had 2 fitbits. I am now wearing the Ionic and the charge 2 - I like to have different size watches. Just me, I guess. But anyway, let me know how you like the 645.
sleep data is not as good as the fitbit - Garmin gives you deep, light, and awake - no REM data is in there which i really miss. i find it pretty accurate. it does not like naps - i think you have to sleep for more than either 2 or 3 hours for it to register as sleep. when i first got my 645 i wore both to compare the 2 devices. sleep was pretty much the same for both. Garmin has you set up a sleep time which is actually pretty cool. the purpose of the regular sleep time is 2 fold. you see it on the graph (did you sleep during your window), but more importantly to me is that your watch automatically goes into the do not disturb mode during this time. this means that you don't have to do anything, but you will not have your watch buzzing while you are trying to sleep. of course you can do this manually, but no need to since it is part of the program. you still have the notifications on the watch, it just doesn't buzz. Hope that helps!
sleep data is not as good as the fitbit - Garmin gives you deep, light, and awake - no REM data is in there which i really miss. i find it pretty accurate.
How would you know if REM sleep were accurate? Fitbit even discloses that the number they provide is an estimate. For REM sleep to happen you have the obvious, rapid eye movement, slight muscle twitching and excess brain activity. Otherwise you're in the deep sleep stage. Fitbit is unable to detect any of these. The numbers they provide are merely a guess based on averages.
