Utterly Mad

I've been having an insane amount of nightmares lately, they usually involve a specific friend purposely locking me in somewhere with 'something'
While I usually know what this 'something' is, and often see it, sometimes I don't and I'm just aware that it's there or it's been following me previously in the dream until I've eventually been trapped in with it by my friend, occasionally I'm rescued by someone else but usually not.