He actually woke up first.

Wei Wuxian has to smother another laugh as he returns his head to Lan Zhan's shoulder. Poor, exhausted Lan Zhan; hopefully the sleep will do him good as he heals.

But should he wake him before mao hour to ensure he gets back in time? His smile fades a little as he contemplates it. Lan Zhan did not say what time Zewu-jun would check on him, only that it would be in the morning -- but it will take time for his brother to do his own morning preparations, he thinks. He hopes.

Surely they can spare a little more time.