Hi XXXXXXXXX...
I did a fair amount of research for you but only found that because common house flies do not have an ability to reason or to anticipate anything, thay can fly around until they die. Their only instinct for landing seems to be to either lay eggs or to eat threfore, they don't seem to need a rest. There is more info here...
http://www.kidzworld.com/article/5758-the-house-fly-a-common-pest
Hope this helps...
XXXX XXXXXXXXX
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