People in the comments saying they're surprised Zenitsu is fighting while being awake and said he change. Hope you guys know people change in life. And also the situation has become more serious which totally a suicide situation too than before so I don't think Zenitsu will still be insecure or a coward like before as he have gain much more confidence in himself. Him fighting while sleeping before was just him scared to face a demon i.e meeting their eyes. But now he become more courageous