Unusual experiences after death or mind tricks

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I would like to know if after someone close to you who has recently passed away came back to visit you either in vivid dreams or in actual person, years ago my grandfather passed away a few months after his death i was on holiday on my own when one night there was a very bad thunder storm i awoke to a vision of my grnadfather sat at the end of my bed with a dog of mine i had as a child, my dogs collar was always to big for her and my mum had it tucked it up into the buckle, now there is no way i would ever know that cause this dog died when i was aged 2, after this vison the following day i called my mum and discribed the dogs collar and colour, my mums breathe was taking away as like she said i would never have known that, now could this mean i had a true vison or could this mean that despite what the doctors and scientist say that as children are memory does not start to register until we are at least over 3 years old.....you say what do you think ?????