REM Rebound. Basically this just means that if you are prevented from getting enough REM sleep, are sleep deprived, or taking medications that suppress REM etc. then you will experience REM rebound, where the next time you do sleep, your REM periods are longer, more frequent, and more quickly entered. Which is why some people like to use sleep deprivation as a means to achieve a lucid dream. There's no doubt it is effective, but probably not worth purposefully sacrificing sleep over.
Hallucinations are common with any stimulant, especially when the effects of that stimulant are wearing off. Even more so when sleep deprived. Hypnagogic hallucinations are pretty specific to falling asleep/dreaming, and not used in such a broad manner as some people tend to think. You experience them when falling asleep. So unless you were nodding off when you saw these things, they were just regular old hallucinations. Or your friend has ghosts.
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