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Point being, two genes in two people is an easy coincidence weighed against the vast sea of conditional variables that effect us all. For myself, if I spend a day doing relatively nothing I wake up somewhat naturally the next morning on 6 hours. If I go all day non-stop, then I can sleep for 12 hours.
If sleep is when our bodies recover, then do people with the mutation recover faster?
Unless you can drop 50 grand on a multicamera Genlock setup, drift will always be potential issue with multicamera shoots. In my experience even the cheapest usable cameras may only drift a few frames an hour, which can easily be fixed in post by slating at the beginning and end of long shoots.
*Stripe meaning record a track of audio timecode on each camera and recorder for sync in your post-production software.