When you said it happened after you changed jobs and new office was not ventilated and you were feeling drowsy, I first thought maybe it was carbon monoxide poi

When you said it happened after you changed jobs and new office was not ventilated and you were feeling drowsy, I first thought maybe it was carbon monoxide poisoning. However, if it is still happening, I am not so sure anymore. Source: Not a doctor. Just scared of carbon monoxide poisoning. You know, going to sleep and never waking up.