I'm sure everyone can relate to this song in a slightly different way, however, although I agree it's about anxiety and depression, I also think it may be about drug addiction. As an addict myself, I relate to this song as if he were singing to the drug or drugs he uses to medicate the anxiety and depression. You become afraid of what will happen to you when you wake up and the drugs aren't there. Although you hate the drug, you are a slave to it in order to stay calm, and control your emotions and pain.
I'm sure everyone can relate to this song in a slightly different way, however, although I agree it's about anxiety and depression, I also think it may be about drug addiction. As an addict myself, I relate to this song as if he were singing to the drug or drugs he uses to medicate the anxiety and depression. You become afraid of what will happen to you when you wake up and the drugs aren't there. Although you hate the drug, you are a slave to it in order to stay calm, and control your emotions and pain.