Sleep problems. After the first fall asleep in the evening I wake up at one or two in the morning. How to get sleep better?

Then it is almost impossible to fall asleep. I go to bed again, I start to go to the trail. the phase of sleep and as if I get into sleep paralysis. But before that, I seem to be falling, falling somewhere, or like falling through the bed, I don't even know how to describe this feeling. After that, I see something terrible, but incomprehensible, like naive, and I try to deliberately open my eyes to wake up. When I wake up I feel fear and anxiety, but I calm down very quickly. I lie down on a new one, absolutely the same story. All this happens in literally 5-10 minutes. There has been no stress lately. There are basically no problems with sleep, but it is not the first time that the same situations occur with a frequency of six months or a year (maybe more often), and I don’t know what they may be connected with. Is it because of the glass hanging to the right of the bed? The only thing I can fall asleep is only when dawn comes.