For a definitive weapon against sleep you could look into modafinil. I haven't tried it because all the shady websites where you can buy it only ship to the US, but apparently it turns off your need for sleep completely with next to no effects of sleep deprivation.
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.
Certainly not all! While I don't have the undying patience necessary to wade through Gwern's entire list of modafinil suppliers[1], it does seem statistically likely that at least one of those is semi-reputable[2] and ships to countries beyond the US. Whether any of them ship to your country is a lower — but still probably finite — probability depending your country's chemical restrictions.
Just to make sure nobody takes the above as facts and decides modafinil is what they need: basically everything in parent is incorrect, except that sleeping is good for you.
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.
Be very careful with modafinil: the side effects can be very severe
"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."
Those experiences seem strangely spectacular, they are very different from any experiences I've witnessed or read about. Also, they decided to just use it to skip every nights' sleep? That's not what modafinil is meant for, nor is it capable of replacing sleep in that way.
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. "
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.