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Or he was taking ketamine, or he was drunk, or any number of other things.

This is not uncommon:

https://www.reddit.com/r/Drugs/comments/3yrulm/took_ketamine...

https://www.getreading.co.uk/news/local-news/floatation-tank...

https://www.ncbi.nlm.nih.gov/pubmed/20533982

That's true for sure but isn't it also deadly to inhale water into the lungs? I think I saw it's like 6 Tbps of water can kill you when inhaled. It feels like it's possible that that happened and, since it's dark and "sensory deprivation" happened that he couldn't figure out what was going on (since he had just waken up) and ended up inhaling more? I'm not really certain.

Ha. At one time, my "go to" interesting story was the time I fell asleep underwater. You sure do wake up in a hurry!