I think it's reasonable to expect yeah, he's still young, but also it's reasonable to expect him to at least be switched on at all times.
He's played too many games to understand he shouldn't be falling asleep that often, and we shouldn't have to keep yelling at him to pay attention with the positioning of the rest of the defensive line and where the ball is going to be played.
I think the one game we drew vs Getafe last season infuriated me because he was switched off and ended up botching the header allowing Getafe to score. He had too many moments like that last season and this one so far.