A) forming tissues or paper-towels into crude, ghost-like shapes in order to clean one's nose, ears, etc.
B) walking aimlessly about one's house at night due to an inability to sleep; usually with lights/television/radio/computer off in order to avoid waking others.
"I know it's shallow, but I haven't been attracted to her since I saw her ghosting her nose."
"Mom freaked me out last night! She was ghosting in the hallway when I went to the bathroom."