|"But if I shut it down for the night instead of to sleep then I will lose all my logins won`t I?"|
Logins? Only one Login, at most, is necessary for your User.
If you're the only User, if you don't use a password, you don't need to Login at all. Yes, it takes a few minutes for your desktop to load - big deal.
"In addition, one also has to consider the strain on the components when the computer is restarted, rather than just brought out of sleep mode or hibernation."
I've heard that argument countless times, but it's one of those things that is not a significant factor in the real world, unless you've got a system that runs hotter than it should . The only time I have ever left my computers on overnight is when I needed to receive a fax automatically, a handfull of times, or when I was running some time consuming test I didn't want to quit, maybe a dozen times. I sometimes leave the computer on during the day for several hours unattended, but most of the time I shut it down when I know I'm not going to be using it for a while, I usually have absolutely no need to leave it on when I'm sleeping, and that applies to most people.