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Garmin Manual Sleep Mode
Some older Garmin watches have the ability to manually place them into sleep mode to track movement when worn during sleep sessions. This feature is in addition to the automatic sleep tracking found on many Garmin watches.
Watches with Manual Sleep Mode on the watch include:
D2™ Bravo
epix™
fēnix® 3
fēnix® 3 HR
Forerunner® 920XT
quatix® 3
tactix® Bravo
vivoactive®
vivofit®
vivofit® 2
vivosmart®
If the watch is not manually taken out of sleep mode it will automatically exit sleep mode once 500 steps have been accumulated.