I believe it, but it doesn't have to be 3 days. Some people are born with a sixth sense. I'm not one of those people. Lol. But when my cousin passed away, he visited me. As someone who has never encountered super natural events, I didn't believe it. I was home alone that day and started hearing footsteps walking from the first to third floor. I followed the sound thinking my sister came back from grocery shopping. Once I got to the second floor, I called out to my sister but there was no reply. The foot steps then stopped and started back up in the basement. I then froze because I realized I was home alone. I didn't really tell anybody because I thought I was overthinking. Might've been the neighbors but after that, my cousin, his sister, told us a similar story involving footsteps that started from one spot and went to another. That's when I knew I was not imagining things. Lol. He also visited his nephew because late at night, my little baby nephew would just laugh and not sleep. Someone was talking to him and it wasn't his parents.