I decided to merge this into an older topic on the same subject. You may also like to read Tasting colours? (synesthesia) in the lounge forum 
I have mild synesthesia (a cross-association between senses) - I associate letters and numbers with colors, and sometimes sounds with colors. It used to be a lot stronger when I was really little but its been fading. However, I’ve experienced intense synesthesia in my dreams. Whenever I see letters or numbers, they appear vividly in the colors I associate them with; for example, I recently had a dream where I saw a price tag marked $32. Also in a dream I smelled a strange fruity scent that was orange and fuzzy looking, although I’ve never associated scents with colors or textures IWL.
I find that sometimes just as I’m about to fall asleep, words and objects and feelings that I think about have really bright colors, often somewhat different from what they would normally be IWL.
So I was wondering, are there any synesthetes here who have had similar - or totally different - experiences in NDs or LDs? And are there any non-synesthetes who have experienced anything vaguely synesthetic in a dream?