ZZZZZZleep Talking Statistically Sucks

According to numerous health, sleep, and psychological specialists, sleep talking mostly occurs in children; only about five percent of adults report sleep talking. Sadly, I am one of those five percent. Though I initially looked it up online because I was curious WHY I did and if there was any way to reduce it (not that it's a chronic problem), I became curious at the statistics and prevalence of it. A few pointers just seemed odd to me, but possibly I am over thinking it.
First, is five percent a truly accurate account of adult sleep talking, or is it just the only provided research available? Conceptually, many more adults could have"problems" with sleep talking but have no idea because they are SINGLE and ALONE. In contrast, sleep talking in children is more likely and therefore more accurately reported because, well duh, they live with their parents (or some guardian).
Second, researchers have had a difficult time pinpointing exactly WHY people sleep talk, though they 'generally agree' it could be due to 'some other sleep disorder, stress, a mental disorder, or sleep deprivation'.
Okay, so the first cause is just unhelpful; great, congrats--you sleep talk because you actually suffer from another worse disorder (you really don't remember walking to the kitchen, eating all it's contents, and singing "Memories" from Cats Broadway?), thanks Mr. Sleep Specialist. In all honesty, it appears to me that sleep disorders are a long way from being fully understood, and hey, that's understandable. Human brains are magical and complex things, and I want researchers and scientists to take their sweet time understanding them instead of jumping the gun with irrational, nonsensical, or convenient ideas. I mean come on, how many children do you know that are overstressed and have mental disorders; most likely few. On the other hand, how many adults do you know with those problems? Hmmm, that's what I thought. Either the causes are slightly south of the border, or children are now aging seven times the normal speed and experience mid life crisis the day they become toilet trained.