You are going to have to take control of what is going around you. Let me tell you a little story. I had a near death experience in 1992 due to an asthma attack I suffered. I went into respiratory arrest and my life has never been the same since.
I hear people that aren't around. I feel people around me. My sense of smell is higher. My wanting to live life to the fullest has never been as great as it is now.
I have taken control of this since I knew that they wouldn't do anything bad to me. They feel warm and they come through the walls at night to visit me. Your baby is going to be fine. You are going to have to comfort your son until he can feel better before he falls asleep.
Try watching some funny movies with him, before he falls asleep. Try and read him stories. Do something very simple with him before he falls asleep. Make sure he is very sleepy before laying him down in his crib. You are in control.
Your kid might be an indigo kid. This might keep happening until he grows up. But to be afraid of the unseen is not what is important. Remember you are in control of your life. Your baby will feel better when he sees you smiling all the time and feel comfort.
Make sure the baby gets a lot of exercise during the day like a lot of crawling, play ball, play a lot so that at night he can have a peaceful rest. This will work.