I Have Paranormal Experiences

When I first moved out of my parents house-I moved into a married couples basement. The house was beautiful and I didn't feel any strange energies before or after moving in. It was a ranch style home with a furinshed and finished basement which they proudly built. The rent was really cheap and the location was close to where I worked and went to school at the time. My schedule kept me busy so I never really got to interact with the couple I was renting from. Also, the basement had a door going to the backyard which I used to enter and leave from so I had very little contact with the owners.
One night, I fell asleep in my room while listening to music. I woken up to knocking on my door. Three patient knocks. Naturally, I thought it was one of the owners coming down to tell me to be quiet. So I got up to open the door and apologize but no one was there. At first, I thought it was my mind playing tricks on me. So, I closed the door, got into bed and tried to go back to sleep. Right when I was about to doze off I heard the knocking again. Three slow knocks. I was too scared to check this time and the slow rhythmic knocking just continued. It went on for about six minutes and then finally stopped. I was extremely frighten and didn't sleep that night. The knocking became a regular occurance after that but I never felt any danger from whatever was knocking. So, I learned to live with it until I was able to find somewhere else to live.