Who with me last night?

I don't know how to explain what happened to me last night. I'm still shaking as I write this. Maybe someone can help me make sense of it.

It started when I got home from work. I live alone in a small apartment on the third floor of an old building. I usually lock the door behind me, but yesterday I forgot. I was too tired and hungry to care.

I made some dinner and watched some TV. Nothing unusual. Around 10 pm, I decided to go to bed. I brushed my teeth, changed into my pajamas, and turned off the lights. As I was about to get into bed, I heard a noise.

It sounded like someone was in the living room. I froze. My heart started pounding. Who could it be? A burglar? A stalker? A ghost?

I grabbed my phone and dialed 911. But before I could press the call button, the noise stopped. Maybe it was just my imagination. Maybe it was the wind or the pipes or something.

I decided to check anyway. I turned on the flashlight on my phone and walked slowly to the door of my bedroom. I opened it and peeked outside.

The living room was dark and empty. Nothing seemed out of place. I sighed in relief. It was probably nothing.

I closed the door and went back to bed. I put my phone on the nightstand and tried to calm down. It took me a while, but eventually I fell asleep.

That's when the nightmare began.

I dreamed that someone was in bed with me. Someone cold and heavy and hairy. Someone who smelled like rotten meat and blood. Someone who whispered in my ear:

"I'm here with you."

I woke up screaming. I jumped out of bed and turned on the light. There was no one there. Just me and my sheets.

But they were stained with blood.

And there was a note on the pillow.

It said:

"Who with me last night?"

I don't know what to do. I don't know who or what was with me last night. I don't know if it's still here or if it will come back.

Please, someone help me.