Hi whitered123, welcome to the forum. I am sorry you are having this experience and that you are finding it frightening. How long has it been happening? It sounds like some sort of visual hallucination. The only way to find out for sure what is happening is to see a doctor, who will probably refer you to a psychiatrist.

I believe some physical conditions can cause this too, so they will want to rule those out first.

A lot of people do have these kind of hallucinations (including me). The first step is to see your GP. Once you know what is causing it, you can have appropriate treatment.

Meanwhile you can get support and advice on this forum.

Please don't be scared, they're not real. I take a radio to bed to distract me, it sometimes works to stop my hallucinations. And leave a small light on.

Goldcrest