I am glad they had him drink the memory potion and that Rumple then took all the blame on himself to save his son from the darkness,
I don’t understand how a memory potion affects darkness in one’s soul. Like not remembering you’ve done something bad completely takes away the impulse to do bad things? It means your soul is turned bright white again? This seems pretty nonsensical to me. Why not just give all the villains memory potions then!
Well this kind of explains that “Hook being a dark one but not knowing he was” thing in season 5. Correct me if I am wrong, but I don’t think he did anything “bad” during that period so this could explain why.
EDIT : Just saw someone else replied to this and your reply.
While I completely agree with your reply for this (lack of sleep, memories). It could be argued that he didn’t see anything wrong with the lack of sleep because the loss of memories could have caused a bit of a reality distortion/confusion. Out of topic, but I wonder how patients that return from coma deal with getting used to following a sleeping cycle again.