All humans are sensitive to paranormal activity. Like the movie, we have a
6th sense. And since you're young, you have a positive energy (heard that somewhere), and spirits are attracted to that kind, so they attach themselves to you.
The reason you see, hear, or feel things at night is because you are more open to it. During the day, you are either busy running around at school or work, or what ever your daily routine may be. At night, you are calm, about to go to sleep, you are relaxed. Thus being, you will experience more phenomena.
Spirits are constantly around you, you just have to be relaxed and open to them in order to see them.
Hope I helped