How to cure insomnia?

I have been sleeping at 3-4am for the past 1 month. Coffee doesn't affect me much. I used to drink coffee before bed time and I slept like a baby. But I'm beginning to think it is the culprit now :(

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Luchs · 51-55, M

I don't have any caffeine past noon and I still have sleep problems. Dr gave me some medicine that works but I don't like using it because it seems to hold on so long. I'm sleepwalking through most of the following day.