Can i take dormonoct 4mg at night table i am using betmiga for my bladder after starting with this i wake at after 3 hours and cant fall asleep again?

In general we, as doctors, do not prescribe a new drug for treating side effect of another drug, especially for insomnia. Have you tried to hold Betmiga to see if insomnia has improved? If Betmiga causes insomnia you should discuss with the prescriber. You should start with behavior therapy for insomnia first before using med. If you insist on taking Dormonoct, 2 mg should be used, not 4 mg.