Hmm, just watched a 'health check' TV news blurb that, (and it was one of those that provided an overly brief synopsis.. like TV is infamous for, providing a headline with little or no detail) stated adults fare better with 6 - 7 hours of sleep a nite vs those who had 8 hours + a nite... whereas kids fared better on just the opposite. I don't recall the name of the medical journal this study was originally posted in to confirm..
Anyway, with my work, I often get less than 6 hours of sleep, then work 12 - 14 hrs, then come home... sometimes I crash, other times my regular schedule just insists on keeping the same hours... which truly screws up my circadian (sp?) rythm. Oddly enuff, my IBD symptoms usually react well to my disrupted sleep patterns, which is just NOT what everyone recommends. I don't recommend it either... just think my body reacts in a defensive way while under this stress, and that long term I KNOW it isn't doing my body any good. does that make sense???