I take 30 mg every 4 hours. Even at night. I have to wake up to pee once a night anyway. It helps me sleep better because I can breathe. Take one before bed, one four hours in, one upon awaking. Of course I say I am taking one, but I am really taking half of one. I would never survive on 3x day and mine kicks in in 30 minutes.
Ask your neuro to schedule a tensilon test.