I experienced this once.
In college, my apartment backed up to a forested area owned by the city (several hundred acres) that served as a floodplain for a river. One night, a coyote got within a stones throw of my window and let out his loudest howl. I woke up from deep REM sleep and I was scared shitless that the coyote was looking through my window watching me. Honestly couldn't move, heart pounding, etc. It is a surreal feeling.
I eventually calmed down and went back to sleep.
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