Task Scheduler doesn't wake up computer

Hi,

I noticed somehow my username is logged off if the computer sleeps too long (like during night).

If I test the task behind my computer and let the computer sleep for a short while, it automatically awakes.

If I allow the computer sleep automatically and for long periods of time, then it somehow doesn't awake the computer anymore. In Task Scheduler I got the error message like: Task has not been executed cause user isn't logged on (this is translated).

So somehow the user is logged off after the computer goes in sleep mode automatically.

What can the problem be? Any (advanced) energy power settings I am missing?

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For now, I checked in Tab General for the specific Task:
* Highest Privelages, and
* also I changed "configuring for Windows 7 (I used setting for Windows Vista and Windows Server 2008)

Maybe this will help.

So, I checked: Highest privelages and configured the task for Windows 7.

This morning it didn't awake cause user was not logged on. Yesterday it worked.

Maybe Windows 7 still just isn't so predictable at all in this kind of things, and A restart here and there might work miracles.

I now have made two tasks. Maybe something goes wrong with the option to repeat the task every 10 min. cause another task was running fine for me after compu goes to sleep automatically (this without the repetition option).

I don't know how I can test this quicker, cause if I put computer to sleep and let it awaken a few minutes later, it works somehow. I never get the message: User is not logged on, can't start the task (other wording then message itself).