[andrewflnr]

I'm pretty sure I've experienced both, actually. Occasionally bits of it, melody or words, will survive in my memory that I think are actually good, if only I could reconstruct the rest of it. Other times I'm pretty sure there was nothing actually there.

[lupire]

The bit you remember might be great. The part you don't remember might never have existed. I've often "solved" problems in semi-lucid sleep, by brainstorming an idea and pursuing it, but when I push, the idea doesn't makes sense, or is meaningless, not just wrong.

[andrewflnr]

Could be. ¯ \ _ ( ツ ) _ / ¯