Hi Rose,
Check the link mentioned below to see if this is how you have set the sleep option.
**http://windows.microsoft.com/en-IN/windows-8/how-shut-down-turn-off-pc**
Method 1: Run the power troubleshooter. Follow these steps:
a) Press the ‘Windows + W’ key on the keyboard.
b) Type Troubleshooter in the search box and then press enter.
c) Click system and security and run the power troubleshooter.
Method 2: Lets us try performing safe mode and clean boot.
Step 1: Perform Safe Mode
Click the link and follow the steps “Windows Startup Settings (including safe mode)”
**http://windows.microsoft.com/en-US/windows-8/windows-startup-settings-including-safe-mode**
Check if you face the same issue in safe mode. If the issue doesn’t persists in safe mode, the place the computer in clean boot and check.
Step 2: Perform Clean Boot.
To help troubleshoot error messages and other issues, you can start Windows 8 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
**http://support.microsoft.com/kb/929135**
Note: Check the title**“How to reset the computer to start as usual after troubleshooting with clean boot”**for reverting to normal mode.
Please reply if you have any questions.