• Late answer, but was just trying to find out why my Windows 10 PC doesn't go into sleep, and after a lot of problem solving found out that the Aerofly USB dongle was preventing the computer going into sleep. I've had the dongle in my PC for the last 4 years, and upgraded to Windows 10, 3 months ago, and only the last month the computer didn't want to go in sleep anymore. Why this happened so sudden I don't know, and I can't get it fixed at the moment, but for sure it is the USB dongle which has something to do with it....