Ghost are still here!

Seems my "ghost" is still here. This time he is using my computer! Night before last, about 3 am, I get up to open the roof vent. I said before I can't sleep at night. This night I was so hot, and the air was on, just not coming on. So, I opened the roof vent over my bed, when I turned to go back to bed I noticed a light on in the downstairs. It dawned on me, it was my computer! It was turned on, just as pretty as you please! No, I didn't go down and turn it off, figured the ghost would when he was though!