Whether you should turn off your computer at night is a complicated question, since some computers can benefit from being turned off at night, while others should be left on. Many people choose to turn their computers off to save power, increase security, and reduce wear on the parts. Others choose to leave it on for overnight-running processes, data sharing, and network or security updates. Ultimately, whether or not you turn off your computer at night is an individual decision, and you'll have to balance the pros and cons. If you have an unnetworked home PC, you may find that turning it off and unplugging it provides the most benefits.