The fact that our subconscious can make up stories in our head while we're sleeping is probably one of the wildest parts of having a brain. Dreamland is a strange place, and the amount of loose teeth/falling off tall buildings/unexpected public nakedness that tends to happen is only the start of it.
Case in point is a recent tweet by @CodeineFridge, pondering why many people never see their phones in dreams, despite using them frequently. What followed was a fascinating discussion about how technology works when our eyes are shut, and the lack of logic behind it.