Laptop wakes up from sleep every several hours

I found out that the laptop wakes up exactly 3 hours after I put it to sleep, so I googled again using this new piece of data.

Paradoxically, my laptop (and probably many other laptops) wakes up in order to hibernate, but for some reason the hibernation fails - resulting with the laptop "staying awake".

Solution

Right-click on the Start button and select "Power Options".

"Change when the computer sleeps" > "Change advanced power settings"

"Sleep" > "Hibernate after"

• On battery: Never
• Plugged in: Never

Source: eightforums.com