According to Žižek,
The Lacanian reading is directly opposed to this. The subject does not awake himself when the external irritation becomes to strong; the logic of his awakening is quite different. First he constructs a dream, a story which enables him to prolong his sleep, to avoid awakening into reality. But the thing that he encounters in the dream, the reality of his desire, the Lacanian Real – in our case, the reality of the child’s reproach to his father, ‘Can’t you see that I am burning?’, implying the father’s fundamental guilt – is more terrifying than so-called external reality itself, and that is why he awakens; to escape the Real of his desire, which announces itself in the terrifying dream. He escapes into so-called reality to be able to continue to sleep, to maintain his blindness, to elude awakening into the real of his desire.