Sleeping with Linux is dangerous

Seriously, using the sleep function with Linux is dangerous. I just put my laptop on sleep for a while, woke it up and apparently everything was fine. But only apparently, because the system fan (you know, the one that keeps your laptop from melting) lost its "medium" speed. That means that it wouldn't run unless it had to go on max. So, after half an hour of peace and quiet, the fan started running like hell, and the laptop was really heated up (it was like being near a radiator). Reboot the system and the "medium" speed works again. What if the max speed wouldn't work either? I wouldn't have noticed it and might have ended up with a brick. Sleeping with Linux is dangerous!!