as thinkxingu says ----
Add in all the "common sense" factors and you will be amazed how fast they go off to sleep ! The ability to screen from the sun is upmost .. and sometimes you can accomplish that by a simple (light weight) blanket or towel.
As you say, don't over think it -- just be a responsible parent
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A bad day on the Big Lake (although I've never had one) - Still beats a day at the office!!
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