"
I'll see you when I wake up,
Mark my words, this won't be the end.
Leavings the hardest part.
Mark my words; I will return
I feel he is blaming someone or something for the nightmares he has. SO when he wakes up he is going to confront that and get his revenge for his nightmares. Or maybe his life choices are giving him nightmares and he is going to get revenge on life.