“L-Alpha glycerylphosphorylcholine is a natural choline compound found in the brain. It is also a parasympathomimetic acetylcholine precursor…” – Wikipedia
“Summarizing, our results illustrate that cholinergic activation via α-GPC did not alter the dream experience significantly nor did it facilitate the induction of lucid dreams.” – http://www.dropbox.com/s/bqtvxsrjybapjdx/manuscript.pdf