The Weirdest Experience I've ever had sleeping

This happened when I was about 27 years old, and I still remember it as if it happened yesterday.

It was a winter night, around 3:00 AM. I was sleeping in my room when I felt that my mother had come in to wake me up.

I was awake enough to understand what was happening, but I didn't want to get up. I kept pulling the blanket over my head and told her, "I don't want to wake up."

She tried to pull the blanket away three times, and I resisted every time.

While this was happening, I suddenly realized something very important.

The door of my room was locked from the inside with a key. I always sleep with the door locked. It was impossible for my mother to enter my room.

The moment I realized that, I decided to look at her.

I lifted the blanket...

The body and the clothes looked exactly like my mother.

But the face was not hers.

Her face was completely black, and her hair was white and messy. In real life, my mother has fair skin, and her hair looks nothing like that.

The strange part is that she never tried to hurt me. She didn't say anything scary. She only kept trying to wake me up.

I was afraid, but I stayed surprisingly calm.

I pretended to be asleep again, pulled the blanket over my head, and eventually fell asleep.

When I woke up in the morning, the first thing I did was check the door.

It was still locked from the inside, exactly as I expected. No one could have entered my room that night.

Nothing unusual happened that day, and this experience never happened again.

To this day, I still don't know how to explain it. Was it an extremely realistic dream? A sleep-related experience? Or something else?

Has anyone experienced something similar? Realizing that the person in front of you could not possibly be there, yet seeing them and even talking to them as if they were completely real?