You might have some other scheduled task, or some other event causing your computer to wake up. The next time your computer wakes from sleep, open the command prompt and run the command powercfg –lastwake. The output of the command should tell you what caused your computer to wake up.

If you still cannot figure out what is causing the computer to wake, or how to fix it, add the output of the command to your question.

You might have some other scheduled task, or some other event causing your computer to wake up. The next time your computer wakes from sleep, open the command prompt and run the command powercfg –lastwake. The output of the command should tell you what caused your computer to wake up.

If you still cannot figure out what is causing the computer to wake, or how to fix it, add the output of the command to your question.

Edit:

Based on the output of the command, it looks like there is a different task that starts your computer. Try SCHTASKS /Delete /TN "\Disk Defragmenter" /f or SCHTASKS /Delete /TN "Disk Defragmenter" /f. I'm not sure if you need the \ or not.

You might have more than one task that starts the computer. If your computer still starts on its own, try the powercfg -lastwake again to see what it is.