dr. belenky maybe you can comment. can these work side-by-side and then talk about safety. >> well, they can. performance is dependent on sleep in 24 hours. total sum sleep, however you split it, divided sleep is good. it can be fine. if total sleep in 24 hours is okay, then you probably are not so concerned about commute time or second jobs. it's when it cuts into the sleep. there are ways of directly measuring unobtrusively monitors that you can see actually track people's sleep/wake history unobconstruivelily. again, that would probably be all right but again -- >> with all due respect, i mean, you're talking, i think, a little bit from a lab point of view. >> absolutely. >> and in the real world of being in a control tower, people aren't going to divide up their sleep very well, i wouldn't think. maybe i'm wrong. maybe both randy and i'm sorry director babbitt and mr. rinaldi can comment on that. i mean, i think this is a very big issue. >> fatigue is real, as i said in my opening statement. we've been wanting to a

dr. belenky thinks is rest but they played 36 holes of golf that afternoon. that is not professional. i don't care how much sleep you had, if you didn't use that sleep wisely and take advantage of it, these are things that we are addressing. some of the stuff you can't do top down. you have to have it from the bottom up. they are inspired to do it. it is a proud profession. they are no happier about this blemish than anybody. >> let me ask you a general question too. you have implemented the nine-hour rest period. i think they had recommended 10 between evening and day shifts only. maybe why the recommendations were closen, is that satisfactory? does that -- closen, is that satisfactory? do you feel it would be most effective in mitigating fatigue? >> one of the 12 recommendations was the nine-hour break between the evening shift and going the quick turn day shift, that was backed with science and said that would give us an extra hour of sleep in our sleep banks so to speak as we were rotating through our shifts. the extra hour between -- the extra hour teen the day shift and the midn