Imaginary beetles

I woke up (in the dream) to see a couple of small beetles on the corner of the sheet. I got up, vaguely thinking about catching them in something and putting them out of the window. Then as I looked I noticed more of the things, groups of them all over the place and then some large black cockroaches amongst them. The scene in the room was getting that weird nightmarish quality to it where things start to spiral into the more and more bizarre. At this point I somehow stopped, there was a change of gear, a change of mood. It was clear to me that what I was looking at didn't make any sense and couldn't actually be true. As I thought this the creatures began to disappear until eventually they were all gone. I felt satisfied that I'd managed to see through the illusion and get rid of them.