Caffeine AM vs. PM?

why is it I can drink caffeine in the morning, and I'm so tired and I can still fall back asleep, but when I drink caffeine at night, I stay up all night?

I dont know the answer, but I am the same way. Go figure!

I'm like that too. My dad says it's because my body thinks I should be awake at night and asleep during the day. I think he's right. I always have a hard time getting to sleep at night.

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