For me, knock at the door.
This post may include affiliate links.
a human in demon cosplay jumping onto you...friends are fun..
Just going for a walk. I work nights and try to sleep days, really miss taking a stroll in daylight!
The random house noises. During the daytime it doesn't matter, but at night your brain is like "is that just the house settling, or did I just hear footsteps?"
That one chair in the corner of your room with a mountain of clothes on it. At two am that thing looks like a person watching you sleep.
The sound of my cat eating a mouse in the dark on the veranda. Cool at 2pm, but at 2 amis really creepy until you turn the light on.
Tapping on the window. It turned out to be a giant moth during the early hours btw but, it freaked me out since I was watching a horror film which didn't help.