Which wellness sources support sleep stages? Human API June 03, 2020 21:44 Updated Follow At this time, Human API supports sleep states (e.g. REM, regular sleep, etc) from the following wellness sources: Fitbit Garmin Withings See the following document for additional information. Related articles Why doesn't Fitbit intraday sum equal to the sum of the all values in day? Comments 0 comments Article is closed for comments.