You saw some weird sleeping mask made of some weird material with all sorts of multi-colored overlapping designs... Seems kinda hippy, but you were looking for something to help keep you asleep with the sun starting to hit your eyes in the morning again. So you took it up to the register where the old wise man looked at it for a second and grinned.
"Ah, interested in astral projection and lucid dreaming?" the old man asked.
"Dude, literally nothing in this place is labeled. I just happened to be looking for something to keep the sun out of my eyes in the morning." you replied.
"Ah yes, it'll do that as well."
"So what was up with that astral projection and lucid dreaming thing?"
"Well with the mask on your soul will loosen it's bind with your body allowing you to astral project or explore your dreams lucidly. To return to you body you simply return and dive into your body."
"Huh..." you mused "Well that sounds interesting, how much is it?" A return trip later it was getting late and you were very curious about the astral projection and lucid dreaming and decided to go to sleep with the mask on. As your consciousness fades you look around in your initial dream state to see a void of nothing but random colors randomly swirling around. with a thought about Astral Projecting a small window appeared which seemed to show the ceiling of your room. Now the real question, lucid dream and potentially do anything you want in your head... or Astral Project and learn some stuff about the actual world?