It could be because your mind is opening up to the possibility of there being such things. Or maybe it's the time in your life when the supernatural
powers have decided to start communicating with you?
Often the beings will first give frightening encounters to awaken people to the fact that the beings are real, and to prevent the persons from getting
overly friendly with the beings.
The main thing is to never be afraid, no matter what they do. When they see you're not afraid then they'll maybe reveal their true natures to you.
Many apparitions are actually energy projections coming from aliens or other powerful beings.
Stay very cool and when you see an apparition just smile and say, "Is that all you've got?" They like it when you're strong because there is so
much for humans to learn once they get over their fears.