I have not experienced it myself but I have seen a relative having an episode like that, it was quite scary for me but like you that person is functional and ba

I have not experienced it myself but I have seen a relative having an episode like that, it was quite scary for me but like you that person is functional and back now. Personally I make quite vivid dreams that make me contemplate how fine is the line of between mind and reality when I wake up. It seems like a subtle mental process and I can totally imagine how it could fail with fragilities and pressure.