Interestingly I can actually remember a couple of dreams I had when I was younger, but sometimes I have moments when I start to wonder if what I'm remembering was from a dream or if it actually happened. Like I remember one time when I was like 5 or 6 riding in the car of my elementary school principal and driving past a soccer field I used to play on around the time, and I recall it raining, but for the life of me I have no clue if that's a memory of a dream or something that really happened (especially since I can't remember why the heck my old elementary school principal would just drive me around in her car, if it actually did happen I wish I could remember why).
Another one that bugs me is I swear I remember at a young age being inside of an arcade and watching someone play a game that looked similar to Tempest but it involved being on a TRON like light cycle. To this day I can't find out if any such arcade game existed, so I don't know if that was just a dream mashing memories of an arcade visit together or I'm recalling some really obscure game.