I actually did the 4-6 hours of sleep on a good day thing for a few years back during Vanilla/TBC/first tier WotLK. I was spending around nine and a half hours a day on work and another eight to ten hours a day playing WoW or watching anime. I'd sleep for about four hours, from about 1pm til 5pm, wake up, order a pizza so they'd deliver me a 2 liter of Dr Pepper. If raids/dungeons got out early, I'd nap for up to two hours more before work.
Gained almost ninety pounds over those few years.
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How do you function on such little sleep? I've noticed such a big dip in my brain's productivity...
So, while not the target for your question, in answer to your question, a two liter of Dr Pepper at night and perhaps another 1-2 20oz sodas at work got me through my screwed up priorities period.
Hope you find a solution that helps you get the sleep you actually want.