Documentation for time.perf_counter says "does include time elapsed during sleep".

https://docs.python.org/3.8/library/time.html#time.perf_counter

But it does not work as expected in Mac OS. I learnt that perf_counter uses the underlying c function: "mach_absolute_time".

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import time
time.get_clock_info('perf_counter')
namespace(adjustable=False, implementation='mach_absolute_time()', monotonic=True, resolution=1e-09)

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The documentation for "mach_absolute_time" clearly states that "this clock does not increment while the system is asleep"

https://developer.apple.com/documentation/kernel/1462446-mach_absolute_time


FWIW, Mac kernel does offer another function which returns monotonic ticks "including while the system is asleep"

https://developer.apple.com/documentation/kernel/1646199-mach_continuous_time

But it seems to be available only on Mac 10.12+.