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drowsy. It's that step that's necessary for you to fall asleep. Caffeine interferes with a denisonin.
The halflife of caffeine is five hours. Which means that five hours after I've had my latte, half the amount of caffeine is still in my brain and body. So if I have a cappuccino at 700 p.m.
at midnight, I'm still going to have about 32 milligrams of caffeine buzzing around in my brain, interfering with the denisonin and maybe interfering with my ability to fall asleep.
Listen to native speakers pronounce “halflife” in real conversational contexts with synchronized timestamps and subtitles.