Please look at this performace benchmark chart. PassMark CPU Benchmarks - High Mid Range CPU's
note: this is the high-mid range section, your cpu is at the 4st place here
Well, when you put your computer to sleep (hibernating is not the same), it stores all your pending data in the RAM, which needs a little - but constant electricity to work. So the pc consumes power, ram and psu. But no other parts are being used.
Yes, it will shorten the life-time of your psu (and ram maybe), but it is not significant. Sleep mode is the same like running the computer, although it has a much smaller impact on life-time.