Just bumping this thread because it's made me a caffeine convert. It's what actually made me join the forum after lurking for some time.
I put in an order for NSI 200mg caffeine pills, 200mg guarana pills and 50mg Pro Plus pills in case I couldn't handle the other two (I'm not a caffeine drinker).
Well, the method works.
My first test: I had stashed the pills away after receiving them due to a hectic few days in which I would have no real time for LDing. I had stayed up all night and had classes in the morning. I got back to my dorm at about 5:30 am with the intent to rest in bed without falling asleep. I popped the 200mg NSI pill and washed it down with some cola, which was probably overkill. The sleep paralysis that followed took me by surprise by its intensity and by how unexpected it was. With Galantamine, I can spend up to three hours laying in bed waiting for sleep, even if I'm exhausted. I usually handle SP transitions well, but this one made me panic with its speed. I can usually ignore SP hallucinations, but I fought against it this time due to how unprepared I was. The audio hallucinations made me think a locomotive train was about to crash right through my window so I was too agitated to work with it and transition. After some struggling, I came out of it.
I decided to switch to Guarana since it's more gentle on the body. It also has somewhat of a time release effect that allows you to fall asleep before the caffeine kicks in. The results so far have been three lucids out of five attempts:
The two failures were my first two tries and I believe it was down to dosage. The Guarana pills I'm using are 200mg yielding 100mg of caffeine. I thought this would be enough, seeing as I'm not a caffeine drinker. While I did get vivid and epic dreams from that dosage, it was only on my third try when I took two capsules instead of one that I finally became lucid. It's worked on the fourth and fifth attempt and I'm quite impressed, to say the least. It results in very high level LDs . On my first successful attempt I had to spend some time doing extensive reality checks. I've started learning how to dream chain in order to countenance the waking up factor.
A sidenote: Moonbeam mentioned 'floating' and getting blown around during caffeine LDs. On the fifth attempt (last night), I was already in the air over some stone amphitheatre on a Mediterranean island when a dream character down below said 'who turned off the gravity?' This is what prompted lucidity and I managed to get down to the ground, albeit with some difficulty. You'll often find yourself drifting in the wind during caffeine LDs. I have no idea why this is.
All in all, this might be the Holy Grail of LDS. More people should be trying this.