I change during the course of a day. I wake and I’m one person, and when I go to sleep I know for certain I’m somebody else.

Dylan frames identity as fluid rather than fixed: the self you inhabit on waking is not guaranteed to be the self you recognize at night. Read biographically, it resonates with his long career of reinvention—shifting musical styles, public personae, and artistic priorities—while resisting any single, stable “true” Dylan. More broadly, the line suggests that experience, mood, and perception continually rewrite who we are, so certainty attaches not to a permanent essence but to change itself. The quote also carries a faintly existential edge: if the self is always in motion, then authenticity may lie in accepting transformation rather than defending consistency.