Something seems to be chewing up the hard drive space.
Hibernation saves the operating system's current state to a very large Hibernation file on the hard drive before powering down. When the system starts up it merely resumes from the saved state on the hard drive. When powered on, the system will have the startup speed of sleep without needing to rely on the system being powered to keep the ram state the way sleep does. Turning off hibernation will correct this issue.
1. Left click on the start menu and type CMD. Then right click on "Command Prompt” and select Run as admin.
2. Type in "powercfg.exe /h off" without the quotes and press enter. If you typed it in correctly, the cursor will simply start at a new line asking for new input.
3. Now just exit out of command prompt.