Thank you for educating me and likely many of our readers on the distinction between hypnogogic and hypnopompic experiences. I, like you, often write lines of poetry in these threshold spaces and yes, it is a challenge to remember the lines when awake. Sometimes I say to myself, because we do have active participation in these states, I trust I'll remember, if not upon waking, but some other time--it's in there, I'll find it. Other times I'll jot the lines down and then actively seek to return to hypnagogia to write more lines. Whether I'm writing a poem, or, my most fun in these states, an essay, or even more fun, just dreaming, I love these states.
PS: here’s a poem I wrote using the method I described above: https://medium.com/channspirations/lifes-contradictions-and-paradoxes-8c99c537a3c0