This story will be short, but it freaked me out quite a bit. I'll start off by saying I'm off work for the Summer (I am a classroom assistant) and recently had surgery, so I've been spending quite a bit of time in my bed. The way my room is laid out, I can see everything from my bed; the closet door is to the left of my TV, the door to my bedroom on the right, and the only window is to the left of my bed. With all of the background information out of the way, I'll get into my story.
I have an obsession with the paranormal, and since I haven't had much to do, recently, I was watching some "true ghost story" videos on YouTube as I laid on my bed. I had my door closed, but did not lock it, because my cat cries outside the door until I open it if he didn't come into the room with me, and since he has a very loud voice, I try to get the door open as quickly as possible. Around 2:30, my mother knocked on my door, so I yelled and told her it was unlocked and she could just come in. She fiddled with the knob, and told me it was locked.
I was very confused, because I knew I didn't lock my door and the lock takes a little effort to twist, so it couldn't have locked on it's own as I closed it. I stood up and made my way to the door-assuming it was just stuck and my mother couldn't get it open-only to find the door was actually locked. I kept repeating "I swear I didn't lock the door" until my mother asked what she needed to know and left. I was left standing in the doorway, completely freaked out because I know I didn't lock the door when I entered.
This event came only days after my curtains had been swaying as if my window was open (which happened every night for a week) when the window was closed and locked. I have no idea if I'm just freaking myself out with ghost stories or if these incidents have some real meaning behind them.