In my opinion there's two things that could have happened here:

The first being that you had your eyes open and transitioned anyway - with your eyes open and then not noticing that you fell asleep during the transition - causing the changes in colour that you saw

The second, and more likely is that when you felt things starting to transition and burst your eyes open - you were already asleep and dreaming! Then since you were thinking you were still sort of awake you ended up having some strange entries to the dream with the colours and what not