Earlier quoted context omitted.
No no no no and no. You can't train your body to need less sleep. Sleep deprivation actually effects your judgment on how much sleep you need. http://serendip.brynmawr.edu/exchange/node/1690
"Affects." Score one for the "sleep deprived." :) First, literally none of the sources in that link works. Every single one is a 404. Second, less sleep != "sleep deprivation." This assumes that people never get used to sleeping more than is physiologically necessary. I sleep 5.5 -> 6.5 hours a night. Plenty of people do. But I used to sleep 8+ hours a night in my mid-20s and anything less would leave me feeling wort…
And I'm not actually sleep deprived, my body just is broken. I have a debilitating sleep disorder. I take (prescribed) stimulants to get through the day, but it only just takes the edge off. I wish I could wake up feeling rested.