Hairy,

I think if you vomit less than most people it means you have a high vomit threshold. That certainly is the case for most of us here. The average emet most recently vomited 12 1/2 years ago. Most non-emets vomit about once a year. Not very many people vomit from sleep deprivation so I don't think that would be a good indicator. Most people vomit from drinking to excess or from getting norovirus so if you can do one of those things and not puke, then you have a high threshold.

Doug