Why does my computer keep switching on?

Why does my computer keep switching on? My computer seems to randomly turn itself on, usually in the middle of the night when I'm asleep. It's in my bedroom so it wakes me up. I'm running Windows 7 and I don't know if it's trying to runs updates but it doesn't seem to be doing anything once it's on. It only seems to do it only when it's in sleep mode rather than completely shut down.
Asked by: Guest \| Views: 295

Total answers/comments: 2

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Guest [Entry]

"You need to check what wakeup mechanisms you have configured.
Any on of them will push it out of sleep.

Check Fix for Windows 7 ""random wake from sleep"" problem.
It refers the powercfg tool,

powercfg -lastwake

will tell you what tripped it the last time...
But, do look at the rest of that posting too."

Guest [Entry]

"I had this problem, it's to do with the network card. I did this:

Right click on your “My Computer” then select Properties.
Click Device Manager on the left side of the Properties window.
Check your Network card on the Network Adapters (Click on the + sign to expand).
Right click on your network card and select properties.
Go to the Power Management tab and untick the option there to prevent your network card from ever waking up your Windows.

If it still doesn't work:

Check out your Power Management Options on your Control Panel (Start, Control Panel, Power Settings, Change plan settings, Change advanced power settings).
-> “Multimedia settings” option, “When sharing media.” ->”Allow the computer to sleep.
-> Check other options one by one while you’re at it."