I'm going to try and induce sleep paralysis.

That's basically when your brain literally paralyzes your body during REM sleep so you don't act out your dreams. Except sometimes people wake up and find themselves paralyzed. And then they hallucinate because their brain still thinks they're asleep, and it really can scare the shit out of you (This is where 99% of alien abductions and demonic spirit encounters come from)

But if you go into it prepared, you can avoid the fears that come with it being unexpected. And it can apparently lead you to have lucid dreams, which are a pretty sweet deal.

From what I've read on the Internets, and this method may thus turn out to be unreliable, is that you have to lay motionless on your back and try to stay awake. If you get an itch or the urge to roll over, ignore it because that's your brain testing to see if you're still awake. And if you want to get out, and this is probably even more reliable, it says to hold your breath and shock your brain into full wakefulness. More reliable sources say to try and wiggle fingers and toes if possible, to look around the room and control what you can to try and help your brain to figure out that you're awake.

Unrelated video filled with lulz:

Warning: Every other fuckin' word in the above fuckin' video is the motherfuckin' word 'fuck' so if you're fuckin' offended by such fuckin' language don't fuckin' watch the fuckin' video. Or read this fuckin' disclaimer.