I shut them all down every day. I don't use sleep mode. Power savings and less wear and tear. Monitors go off every night as well.
Might as well, less than 10 seconds to boot anyhow.
I also turn everything off at night!
Well you got a use common sense, most hard derives and fans have a certain life expectancy, they will not run forever. So if they are shut down at the end of the day and they sit dormant all night, you can effectively increase there life span by at least twice.
While working at Texas Instruments everyone was told to leave all computers on 24/7, now we are talking about 80,000 employees with 50,000 computers, there were a lot of hard drive and fan failures, not to mention the increased electrical usage. So then the company sent out an email asking everyone to turn OFF their computers when leaving work for the day, and after the first year, they noticed a significant decrease in hard drive failures.
So, that's how I run my computer today, at the end of each day, they are turned off and get a break just like a person, they get a chance to cool down, and give all the little electrons a chance to rests.
Power supplies that get a chance to cool down, also last longer, heat is an big enemy of any electronic device.
Monitors will also have a longer life, (about twice), if the power supply and inverter board are not energized all night.
Leaving your computer on 24/7 is quite a wasteful practice that will slowly suck the life out over time.