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Which fitbit models can wake me up during light sleep around the time of my alarm?

Hi. I am looking to buy a fitbit watch that can wake me up during light sleep, maybe less than an hour before my alarm is set to ring. I wish someone could advise a few models to look into. All of the models I could find have the sleep tracking function, but they don't say whether they can wake you up in this way.

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Fitbit calls that feature "Smart Wake".

This is Fitbit's explanation:

JohnnyRow_0-1667226234540.png

Note the alarm is a silent vibrating alarm.

I believe all models Fitbit currently sells have this feature.  I personally do not use it so cannot give any opinion on how well it works.

Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.

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I use this feature on my Charge 5. It works well enough. It rings during light sleep typically or sometimes when I am already awake. If I still sleep deeply enough or in REM it will ring later. It is rare it rings at the time limit. 

It vibrates and wake me up without problem. 

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