This is a step-by-step article.
When I put my PC into sleep mode, it automatically wakes up at certain times. What can I do about it?
PCs don't know any sleep disorders. If, however, the computer wakes up unexpectedly regularly at night (or even during the day) at certain times, you should check the power saving modes. May be the PC is activated by timed action of the system or an application. These include, for example, scheduled backups. How to proceed:
1. Click on the Windows icon.
2. In the field for Search programs and files enter the command Power options.
3. In the result list of the start menu, click on Power options.
4. In the current power plan, click the entry Change power saving options.
5. In the following dialog box, click on Change advanced power settings.
6. Under Power options click on the plus sign in Energy saving.
7. Click on the plus sign in Allow timer for activation.
8. Now change the preference under Allow timer for activation from Enable in Disable. If you are using a mobile PC, enable for both areas On battery and Network operation.
9. When finished, click OK.
Note: The automatic wake up could also be caused by other reasons. If this guide does not result in the desired effect, see also the other contributions of this series.
For more useful information, see the following articles in the Microsoft Knowledge Base:
2642510 PC automatically wakes up from sleep mode (I)
2642546 PC automatically wakes up from sleep to (III)