This isn’t really a computer issue, but it was something that was really annoying until I found the simple solution.
Our Hunter ceiling fan has a remote, and we found that it would randomly turn itself on, or change speeds in the middle of the night without warning or for no reason. We replaced batteries in the remote but that didn’t fix it. I did a quick Google search and a bunch of other people had similar problems. My favorite solution someone posted online: “Maybe your ghost is hot.”
Anyways, I discovered that there is a dip switch on the receiver and remote that sets different frequencies. If you are having this issue, it is likely that something else around you (a neighbor’s garage door opener, or some other device) is interfering. I saw a lot of reports that these ceiling fan remotes work from incredibly far distances.
So, the solution is to change the dip switch. Here are a couple links to Hunter manuals that discuss this:
Random Windows Tips & Fixes 