I don't think I would want to fall asleep in front of the SLEEP doctor...he's liable to tell you THATS WHY you have troubles sleeping because you nap in the day time EVEN though you don't. LOL But definately falling asleep in front of him wouldn't be a good idea.
As for the nap right now....You could take a 20 minute cat nap...ONLY 20 minutes. It will be enough to rejuvinate yourself but shouldnt be too much sleep to prevent you from hopefully sleeping tonight.
Set your alarm....have someone call you whatever it takes but NO MORE then 20 minutes. :)