I was laying in bed and had falling asleep, after I woke up, I didn't really move. Just pull some more covers over me and after a couple of seconds, I felt my whole body weigh down.. I had like a flash of light in my vision and I heard this increasingly loud ringing sound. What was happening?

Something similar like that has happened before at night and I saw faces and places but then I stopped because I was scared. Are these close to WILD?