As M said, nowadays having a nap or waking up at 9 o' clock is a luxury that our society, most of the time, doesn t give to us because we have to be productive 24/7.
In my humble opinion, there are people that are more efficient when they are not under oppressive deadlines and when they have a more elastic and customized timetables. Here the problem arises: combine the needs of the society with those of the individual.
P.S. In 99% of cases the individual must adapt.