I wish my computer could do this.
I just turn mine off every Wednesday before I go downstairs to have breakfast, then I come back upstairs, unplug it, re-tidy my cables (I keep forgetting to buy cable ties), open it up and dust out all the fans. 8am Wednesdays. I get it back online at roughly 8:20.
It also defrags during the night (it's always running) every night; changing this to be once weekly as well or one partition per night. I like to keep my computer tidy (I have a system/media volume, a files volume, a games volume and a webfiles volume for my local webserver on it :3)