In my opinion, sleepwalker is much alike to daydreaming.
Explanation:
Your mind is somewhere else but your presence is in a place you do not know you're still in. In life, we are sometimes sleepwalkers; not literally walking while asleep, but continuously going with the flow of life without knowing the purpose why you are still striving to live everyday. And I think it's normal, it happens to everyone. Maybe time will come you'll also realize your purpose.
