When I did do the mega training the 2 and 3 a day sessions I found the only sleep I could get would be
This is college and the brief year or so after college where I just wrestled and did not work yet.
I found I was too hopped up or jacked up from endorphins etc to get more then say 4 or 5 hours tops at a time sleep.
Occasionally post college I would training for a different timezone- I was in mountain time but competing in
US central time, south america, and eastern europe,
so although the training stayed similar my 'day' vs 'nights' changed a little bit not a huge thing.
Probably allot of that has to do with weight cutting- that being on serious caloric reduction kept me awake
and just plain out overstimulated either endorphins or CNS.
I would do some early AM roadwork that was usually on my own
then an Am conditioning and or wrestling practice
afternoon/evening wrestling practice
and sometimes after that some later night time weight cutting - but not everyday
usually your doing it with another person cutting.
so your looking at 3 or sometimes 3.5 training sessions or like 30 to 40 hours a week
so yes naps where essential.
I would take a nap after roadwork
and a second nap usually before afternoon practice.
these would be short 30 mins at best and at night I really could not get much sleep
even though I would be exhausted
really the recovery thing is far far more important then people give credit too...
if naps work for you try them
research goes both ways about daytime sleeping so you might see some conflicting evidence.
more important then sleep was ice ,
ice packs ice buckets for my feet, and the best was a full on ice bath-
some facilites had ice machines but really it only takes a bag or two to keep a tub fridgid.