if i stay up too late, that happens to me, too. when i used both Melatonin and Valarian, i was out like a LIGHT no matter what. i think it's decent restorative sleep, too.
listen, i don't know what's up with you and Simon, since it's been so long since i've been online, but there are questions about using Melatonin when pregnant, too. i'm risking it during the "trying" phase, but will probably give it up when I get pregnant... just FYI.