Question

I have a question. Last week we had some kind of business event. One guy, rather small, rather young (18) decided to drink a few drinks. Fyi: in my country it is a legal drinkink age!

He also did not drink an exreme amount.

He was able to walk to his hotel without any problem, only slightly drunk…

Now the weird stuff: the next day he did oversleep. Ok can happen no problem. When the tried to wake him they did not get anything from his room, just his smartphone alarm going off nonstop.

They got into his room but they could not wake him. When they put some water into his face he opened is eyes, but was not to wake. They tried everything…

They decided to give him time to sleep it off.

2 hours later they got him awake, he was totally hungover, did not know anything from the night before. And he did sleep 9 hours …

The guys who went out with him backed everything. The only thing he knows was that he got in his room and blacked out in bad.

Now my question: can this be related just to alcohol? I saw alot of drunk people, but you could get them to wake up. This was just so weird.

If its not the alcohol what could this be?