Iwatch green light at bach
Green light at the back side of watch is keep on from last night,What to do for turn it off?
Apple Watch SE, watchOS 8
Question marked as
The green light is the sensor for heart rate, and it would be unusual for it to remain on continuously unless there is ongoing heart rate measurement. (This seems unlikely because it would increase battery drain). The likely cause is something confused in the Apple Watch software.
The easy fix will be a forced reset (reboot). Simply press and hold the Digital Crown and the Side button (together, about 10-15 seconds) until the Apple logo appears, then release the buttons and let the watch restart.