Eh, like that's fair its personal preference but the energy waste of just having your PC idle is just weird to me. (Folding@home is totally reasonable)
With several comments now showing surprise about this, is sleep mode or hibernation not common knowledge?? Windows and every Linux distro I've tried has sleep mode enabled by default.
I wouldn't, and I don't think most people would, consider being in hibernation mode or sleep mode as "on". Sure, it will add to your uptime, but like its a demonstrably different power state.
Mm, fair if you are running some task while you're not "actively" using the PC. Although given the general sentiment of people in the replies, the leading reason is "I'm lazy" or "its convenient".