I constantly have to wrestle with Sleep Mode. Even though my Power Setting are correctly set there's always something else, a software, a hardware, a drivers, etc, that disturb those settings and prevent them from functioning correctly. One day everything works and the next day my PC doesn't go...
driver conflicts
drivers
energy saver
event viewer
fast startup
lid switch
power management
power policy
power settings
powercfg
sleep and hibernate
sleepexceptionssleep mode
task scheduler
uefi
unexpected wake
usb selective suspend
wake on lan
wake timers