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Old 12-06-2018, 04:45 AM
  #6  
JohnBurke
Disinterested Third Party
 
Joined APC: Jun 2012
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Originally Posted by 742Dash View Post
NASA reached a different conclusion.

https://www.nasa.gov/home/hqnews/1990/90-090.txt
No, NASA didn't.

The Ames very limited minor study, involving only ten crews, divided in two, on four flights, is small population, statistically limited, and does not represent the position of NASA.

It's quite common for crews on long haul flights to close their eyes for a few minutes, sometimes much longer. Many of those doing the long legs in supplemental work lack the protections afforded by Part 117, and take sleep where they can.

Sleep science in the last few years has changed substantially from what it was. For many years, the concept of "cat naps" was considered valid; this has been proven to not be the case. A complete sleep cycle, which is necessary for all phases of sleep to be covered, takes 3-4 hours. Sleep which does not encompass a complete cycle may actually contribute to a sleep debt, much in the same way that food without nutrition might fill a stomach, but does not fill the need that the body has for nutrition. Likewise, one might close one's eyes, but does not get the rest needed during that time. More the illusion of rest, as a belly fully of popcorn might relieve hunger, but do nothing to nourish.
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