You wake up with a shock, sitting straight up before you know it. Cold sweat is running down your back and your knuckles are tight with adrenaline; half the sheet has been pulled loose and lies crumbled underneath you, revealing the bare mattress, slightly tacky against your skin. There's a high-pitched squeaking coming from somewhere, like a cabinet door swinging on its hinges. The faint light from the street lamp outside veils the room in shadows, making it look strange and unfamiliar.
No one is in here with you, you know that. The feeling will go away as long as you don't think about it too hard.
Go back to sleep or go look for the cabinet