Chalk Holder Lately Ive Been Seeing Things. Like A Few Days Ago I Got Up To Sharpen My Pencil.?

Lately ive been seeing things. Like a few days ago i got up to sharpen my pencil.? - chalk holder

and the corner of my eye I see a piece of chalk, glide through the holder of the chalk thing. And I was in my office heard the teacher and the corner of my eye I thought I saw a big bug crawling on my work ....... Whats going on?