I fell asleep and zuhr finished

I can't remember exactly what happened but I think I were sitting down waiting for someone to get out of the bathroom so I could do wudu so I can pray Zuhr? I was in my room right near my bed so I just decided to jump in my bed. One thing may have led to the next and I woke up after during Asr prayer. I think I may have been quite tired. What do I do now? Shall I pray Zuhr namaz with Asr namaz or shall I pray Zuhr with the intention that I overslept?