Jose wrote:
I think this is oranges and grapefruit, and an example of selective
data. Guiliani did many other things at the same time, and it may well
be that it was those other things that reduced crime. What crime in ATC
are you aiming to reduce?
Ok an example that was probably too far afield. Are you suggesting
that the beautifcation projects had no impact for the better on the
city?
Studies have shown that napping improves performance after the nap. (In
some political jobs, it arguably improves performance during the nap. 
It is my understanding that air traffic control is a stressful job,
and that's one of the reasons scope time is limited. Anything that
would improve alertness while at the scope would be good. Naps do that
with no down side.
What sort of nap? Length of nap? Location of nap? How much napping
per time on shift? Whas the study specific to the ATC function?
Please provide the data. If its true that napping will help our
controllers, then the FAA should enforce naps during break times.
Provide cots and blankies and teddy bears.