Before I got on olanzapine (which totally rebooted and kickstarted my sleeping patterns) I would take sleep meds, lay awake for a couple of hours, fall asleep for (if I were lucky) 2 hours, wake, take another dose of sleep meds, lay awake for another couple of hours, and fall asleep for (if I were lucky) another 2 hrs.

Maybe you could do something like that, too? Take another dose when you wake up?