I'm guessing there isn't enough research yet to say what effect your sleep pattern might have. It could be that concentration is important above some particula

I'm guessing there isn't enough research yet to say what effect your sleep pattern might have. It could be that concentration is important above some particular point and as long as you are getting sufficient regular sleep you keep it below that point. It sounds like there is also genetic variation in production, so if you have a generally lower production then a higher level due to your sleep pattern might still not be that high relative to others (or if you have higher than usual production then long days could be more likely to cause trouble). As someone with a circadian disorder, the thing I would worry about most from your sleep pattern is triggering a circadian disorder. At least Non-24 seems likely to have both a genetic predisposition and require triggering in many people (some have it from birth). This would be most likely if your normal rhythm seems to normally be longer than usual, although even there it isn't necessarily a problem since cave studes show people slip naturally into the type of sleep pattern that you describe. It might depend on how you do the transition (and how close you get to a two day cycle on your long days). But I would suggest at least being very observant of your circadian rhythm. Things like when you get hungry, feel tired, and have to pee can indicate how your circadian rhythm is doing and if those things change when you aren't staying up late then that could cause serious trouble eventually.