Re: should i leave comp in sleep mode ?
don't worry about that. you can turn it on and off as you want.
i personaly set it to sleep when i don't use it. that way i safe time when i want to use it again.
it takes a little more power in sleep mode rather then just turn it off, but if i did that i would not turn it off before i go to sleep or are away from home more then 2 hours. now i set it to sleep when i walk the dog, make lunch and other things. i have a powersafing strip that shutsdown my speakers, my 2 monitors and my G19 keyboard when the computer goes to sleep.
if you are gonna do the same thing as me i will advise you to sometimes just restart it. it's not a server and therefore background programs and services needs to be restarted once in a while. i do that once every 2 weeks. works perfect for me.