Mac Sleep Guardian
Sleep Detection Stopwatch
Runs entirely in this browser tab. Active CPU Time counts the seconds the processor actually spent awake; Actual Wall Time keeps the real clock. When the two drift apart by more than 2 seconds, that is a sleep.
Active CPU Time
00:00
Actual Wall Time
00:00
Sleep Log
No sleep events yet. Close the lid and let the Mac sleep while the stopwatch runs to record one.