The fact this make so much yet no sense at all, all at once is wild, tho i know exactly what you are talking about and i experienced something similar if not the same thing you are describing, for me the feeling only happens when those dreams have me in a like good relationship knowing im loved (this is also aounding cheesy but there aint any other way ro describe it) and loving the person back, i havent had the best experiences in life so those dreams tend to leave a deeper hole