Just because a particular natural phenomenon occurs over a period of "24 human hours" why does everyone has to plan his life around it. I mean its definitely not natural or instinctual. When a child is born he doesn't starts sleeping or getting up or eating according to that. In fact he is trained, forcibly, to follow that set of rules to make our life easier. My day for example has lately been occurring in more of a 36 hours cycle than 24 and its making me feel guilty and bad which i don't think i should be feeling.
