I have Aspergers syndrome which is in the Autism Spectrum and I can sense when there are spirits around but not see them or sometimes I have premonitions which came true.
When I was a little girl I could feel a presence of a 6 year old girl who died at our house and she used to play tricks on me which scared me a lot. When I got a little older I had 2 premonitions that came true, one was the family getting into an auto accident and the other was my cat getting run over.
I went to my friends house and sensed a spirit so I asked if there was a ghost in the house and he said yes. It was his grandmother who was haunting his house and he could actually see her which I was jealous about since I never really saw a ghost.
My cat died when I was 16 and he was my best friend growing up so I was sad. I had a beautiful siamese mix growing up and when he finally passed away I was devastated since he was 23. The first night he was gone I felt him jump on the bed and he was purring up a storm in my ear but when I turned over he was gone. That happened for the next two months until we actually buried him in the backyard next to our old siberian husky. After he was buried I saw him one last time sleeping in the bay window which was his favorite place to sleep and I still get teary eyed when I think of him.
About that time we had a Norwegian Elkhound who had to be put to sleep after she had horrible seizures and we knew it was time. In the winter she loved to play in the snow and would wait by the door to go outside. I saw her waiting by the door and when I looked again she was gone.