When it comes to music and themes there are many that could suit Charlie, but if chosing two in this case that i feel represent him the strongest it would be:
Fear of the dark - Iron maiden
Dreaming - system of a down
Plagued by constant nightmares (as we both are) i feel these would represent him very well. Nightmares in his case somewhat takes over his mind from time to time forcing him to dream in a awaken state. Hench i thought dreaming would be a good fit for this and fear of the dark due to the trauma Charlie endures at nights which builds up a fear for the unknown.