I take 1000 mgs Depakote 10 mgs Valium and 10 mgs Ambien (zolpidem) at bed time. Should I still be having trouble going to sleep.

No, you shouldnt. That is a hefty dose of sedating medications and if you are still having trouble sleeping, discuss with your psychiatrist. Is it possible you are entering a manic episode? Check in with your psychiatrist sooner than later to be safe. May need improved sleep hygiene as well as possible sleep study too.
To much medications. Find another doctor for a workup and a different treatment for . Insomnia.