Belsomra
"I have trouble staying asleep.  Doctor prescribed belsomra @ 5 mg. Fell asleep as I normally do,  woke up 90 minutes later just like always.  Took another 5mg, fell asleep,  woke up every hour,  on the hour.  No effect at all. 
And I'm not withdrawing from ambien,  I haven't tried any rx for insomnia."