I feel like this song is about trying to quit caffeine, and drinking some type of fake coffee instead (like Celestial Seasonings Roastaroma tea, which does in fact contain cinnamon and has a picture of cinnamon sticks on some editions of the box). The references to heavy sleep (the narrator just woke up but it's almost noon, then "let the sleep begin" toward the end) seem to me to support this as well. Though I agree with PremiumTrash that the song describes symptoms of depression, I also think that many of these symptoms occur for someone with a caffeine habit who is trying to go without - mostly due to my own personal experience of my multiple attempts to do so. The chorus lyric of "it's so beautiful... but it's not real" would easily match up with this explanation as well, since the tea with cinnamon would be a substitute for a caffeinated beverage.