Daylite ? Time

YglesiasYglesias makes the point that according to recent research not only daylight savings time not save any energy, but that it may even increase energy consumption. Has anyone studied whether by interrupting sleep patterns it may to a small extent make us less efficient until we had adapted to it? Also, how many appointments are missed; how much time is lost changing clocks; and how much energy is used conforming programs to meet these time changes?