I have been using Windows 7 for several months and generally like it. However, the sleep mode does not work consistently. It works for a few days, then stops working. In that time period, I have not gone into control panel and changed anything - it simply stops working. I can go in control panel, make any change, and it will start working again for a few days. My other concern is how to set up sleep mode so that mouse movement wakes the computer. Obviously, I like this feature and want it to work properly. Any suggestions?