I know this is probably a noob question, and one that has been beat to death, but I haven't really been convinced.
Is it ok to leave my computer on 24/7? Should it be in sleep mode if I do?
The only thing wrong with keeping it always on is that dust collects, otherwise computers are happiest being left on. However for power reasons I have my laptop set to turn the monitor off after 15 min and go to sleep after 2 hours.