[terhechte]

I have a gaming PC with Windows and Linux. "Sleep" on Windows fails every second time for me (the screen is off but the machine continues to run), whereas on Linux it fails every ~10th time. No idea what the issue is but I have fairly standard hardware. On the other hand, I can't remember the last time sleep didn't work on any of my Macs.

[crummel]

How long are you giving it for sleep to actually turn off? "Hybrid sleep", which is on by default now, can look like this - the monitor and peripherals will turn off first and then it can take another minute or so while the machine writes out its RAM for the hibernate portion.

[the_only_law]

I had an odd issue with Windows sleeping on one of my machines a while back.

Once the machine went back sleep, I could not get the video signal back. All the other hardware would wake up fine, but I’d have to fully reboot to get video back.

[gsich]

Sleep might not be hibernate. If it's just standby some device (Mouse, ethernet ...) might wake it instantly.