I turn off my computer when finish work but it turns itself in the middle of the night.

My computer seems to have a mind of itself. He wakes at night after being off for hours

This problem is sometimes because your system is set on "Wake on LAN" which means that if a packet of information happens on your Ethernet (Internet) connection, which could bring your system to wake up and then find nothing to do.

There is a good reason for that custom this feature in some environments, but usually not for a computing environment.
You may have a task on demand that you have added or some third party program you have installed has added for you which could be put in place to wake up your computer when he thinks it's time to run.
If you use the Stand By option and you have cats, they can walk on your keyboard or mouse and that might be enough to turn your system off Stand By.  If you are sure that you are really close, it would not be the problem,

The parameters might be in your system or part of your Internet - BIOS that can be disabled if you don't need.
You can search on the Internet with something like Google for your system and model and of wake on lan and should be able to know how to disable it for your system of brand not specified and the model.
You can experiment and before spending the night, turn off your system in the usual way and then physically disconnect the Internet cable and see how things look the next day.
Since the Microsoft Answers forum does not have any kind of information system request when a new question is asked, we know absolutely nothing about your system.  Not knowing the basic information a problem prolongs the frustration and the agony of these issues.
Thank you MS Answers, allowing the resolution of simple problems as frustrating and a lot of time as possible.
Provide information on your system, the better you can:
What is your system brand and model?
What is your Version of XP and the Service Pack?
If the system works, what do you think might have changed since the last time it did not work properly?

Tags: Windows

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