Sounds and Breathing from Brother's Empty Bed at Night

Recently I was left alone, the 'rents went away for three days.
Before that I'd had experience of autonomy lasting even weeks — literally the best time of my life. Back then there was no creepy shit, but the light in the hallway was always on.
But in the case under consideration, the following happened.
The thing is, my bed and my brother's bed are arranged in a T shape, that's the shitty layout.
I was used to two sounds while falling asleep — my brother's snoring and his farting. And on the latter I even developed a neurosis. And he farts stinkily, too.
But then it turned out that a sick portion of the sounds I took for oral poops weren't connected to him at all. They're little not-quite clicks, not-quite knocks, not-quite the sound of a sharp release of a small amount of gas. And now my brother's gone, but the sounds are there. Having shat myself, I chalked it up to the neighbors or something else.
But far more interesting is another thing — my brother left, but someone is breathing from the bed! Bitch, I swear on my tooth I'll be damned, I heard breathing. That's what made me shit myself. And it was 4 a.m., I was fucking exhausted, my head was mush. I looked at the bed and saw only a small plush bear there. Having hit the copium on the theme of 'I imagined it', I lay back down without hindrance. But the feeling of someone's presence, of a gaze, suddenly sharply and decisively appeared. That day I'd been thinking a lot about postmodernism and it seemed to me as if a three-dimensional figure made of glowing lines — of my brother or another person — was looking at me from the bed. Having gotten thoroughly scared, I confidently removed the plush bear from there, put it deep on the shelves on the wall and crossed myself and the bed. Only after that was I able to fall asleep.