Do you turn off your computer at night?

As in IT consultant, I am sure you were asked this question many times “Should I turn my computer off at night or when I am not suing it or should I leave it on?”

I think the world is divided on this issue, some tech would tell you to turn if off and other would say, including myself, if you are a heavy computer user, never turn it off.

Turning the computer on and off each time would wear out its components, just like a car, if you turn it off each time you stop at the red light, you would harm the engine and other components.

But now, there is the issue of reducing energy use and green IT, is it better to turn off the computer when is not in use, or is it better to put it on standby mood or sleep mood? What would consume less energy? And if we have hundreds of computers, how much energy we would save verses how much tear and wear these computers would suffer for each start up procedure?

I don’t know the right answer, but I leave my laptop on most of the time, I still believe that power on procedure or start up takes a lot of energy to complete.