The rarity of observations of specimens and the extreme difficulty of observing them alive, tracking their movements, or studying their mating habits militates against a complete understanding.
It is possible that people who take a siesta have different physical activity habits, e.g. waking earlier and scheduling more activity during the morning.
In essence, it helps retailers collect information on customers' buying habits-through loyalty programs and the like-to figure out how to get them to buy more.
Behavioral therapy may include, learning healthy sleep habits to promote sleep relaxation, undergoing light therapy to help with worry-reduction strategies and regularizing the biological clock.
