I talked to my psychiatrist about melatonin. I am no longer on amitriptyline. He said it is most effective if taken consistently over a period of days as part of a larger effort at re-setting the internal clock. He also recommended exposing myself to light during daylight hours and turning off lights in the house as bedtime approaches. He said it's typically most beneficial to take it an hour or so before bed, not immediately before bedtime. I am taking 3 mg. And I'm still waking up in the night.

Hope you find something that works!