Q:
A: i think its better to leave them on, as most modern computers have a sleep mode that is designed for just that purpose. besides if you constantly turn computers on and off, the initial power on makes other parts of the computer (ie. hard drive, RAM memory chips) work harder thus depleting their working life. if you're concerned about saving Energy, make sure your Operating System goes into "suspend mode." the amount of power your computer uses is very minimal.