But I wouldn't use it to skip more than a night of sleep. Sounds like a bad idea because you do need to sleep. Sleep is good for you.
[1] http://www.gwern.net/Modafinil#suppliers-prices
[2] See /r/nootropics or LongeCity for reviews.
Modafinil does have various side effects, does not allow you to never sleep, and you do have some effects of sleep deprivation if you use it to skip nights. The shady sites that sell it do ship to non-US addresses. Your doctor probably also has it (provigil), if you have narcolepsy.
"later in the evening she fainted from exhaustion and woke up blind. It took the longest two minutes of all our lives for her eyesight to return fully, and she developed shakes like I’ve never seen, which we couldn’t stop"
“I was mid-conversation and my nose started to bleed uncontrollably, blood was gushing. I completely freaked out”
“Physically, he looked rough, says Charles. He was completely exhausted, his cheeks were pasty and grey, and his body was exhibiting clear signs of sleep deprivation.”
“One friend tried the drug just once, and was plagued by serious, mind numbing headaches. Another couldn’t sleep for two days, despite spending 8 hours in bed per night trying."
Source: http://www.nouse.co.uk/2009/06/30/modafinil-the-new-wonder-d...
More people doing dumb shit without having a clue, I guess...
"With a Friday psychology exam looming, she stayed awake nearly sixty hours,
sleeping for just four. "