Waking up to find zombies lurking about (srsly).
Unexpectedly getting stabbed with a knife from behind, without any warning that it's coming (even in broad day light).
Falling down and losing a tooth/teeth.
Waking up one day and not remembering anything about my life.
Finding a scorpion under my sheets.
A tapeworm crawling up my throat.
What are yours?
What causes these kinds of nonsensical paranoias, and how does one go about remedying them?