Why do I fall asleep so early all of the sudden?

I moved in January so maybe that has something to do with it. Up until then, I would drink a coffee, and easily stay up until midnight, and often until 2am. Sometimes 3am without feeling very tired. Now regardless of whether I have coffee or not, I fall asleep at like 8:30. What's the deal? I tuned 31 in December. I thought maybe it has to do with aging, but I dont think it could happen so sudden like that, could it?

Why do I fall asleep so early all of the sudden?
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