Second, it's normal, just like when you finish breakfast ... it's almost noon, you want to have lunch ... it's almost time to get off work/school, and you think it's time for dinner. Man, the same scene appears again, every day is different, but you can do the same thing again. It is normal.
Third, you can only talk in your sleep. This habit is not good. Important things are easy to leak in sleep.
Fourth, the sound of the steel ball landing is not necessarily from your building, but may be the sound of the steel ball landing/grinding from the neighbor's house. If the sound insulation of the building is not very good, it may be the sound coming from downstairs, or it may be the sound of local fracture of concrete.
Fifth, it's just an echo. If you walk lightly when you land, there won't be/you are going upstairs, and people come in at the entrance, for example, people walk quickly first and then slowly.
Sixth, it is the light reflection phenomenon of things like mirrors/window glasses, or the illusion that things like curtains are blurred in the brain because they are canthus.
Seventh, having nightmares, there is nothing to explain. It is related to the stress of work/study during the day and physical fatigue.
Eighth, your subjective consciousness is caused by paranoia.