Why are my dreams so beautiful and give me nostalgia when I wake up?

I always find myself having beautiful dreams or seeing beautiful people in them. I even had a dream about seeing the Bible and reading it and sometimes I think dreaming is better then being awake and living because it feels so dull and plain compared to having dreams so beautiful I get a nostalgic feeling when I wake up.

Why are my dreams so beautiful and give me nostalgia when I wake up?
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