[hprotagonist]

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