My experience isn't one that is amazing or scary, but this occurred around the time my great grandmother passed away, give or take a few months after she died.
One night, I was very tired and I accidentally fell asleep with my TV on, the specific channel was Adult Swim (I like watching Family Guy at nights), but that isn't the strange part. The strange part is when I was in a weird state.
It was an early time around 6 or 8 in the morning and I wasn't fully awake, but I was on my left side and I felt someone rubbing my back, just like how my grandma did when I was upset. I didn't feel any fear or discomfort. It felt reassuring and loving and when I actually woke up I looked at my TV and found that it was on a completely different channel, a Christian channel (she was a very faithful Christian).
Now keep in mind that channel that Adult Swim was on is far away from the Christian channel and there is no way I or my dad could have changed it because I was asleep and the remote isn't sensitive to touch, you kind of had to press on it.
Now, after I woke up I told my dad, my girlfriend, and my grandmother about this, all which say that she came to visit me, but my dad's friend at the time said to be careful because it can be a negative spirit tricking me. Since then I haven't had this happen to me, just that time. I took his advice and didn't welcome it just yet. So my question is... How do I know or find out? Should I just ignore it?
Another detail: Till this day her death upsets me greatly because she and I were VERY close to one another.