For me I've found that it takes a while to take full effect. I normally go to sleep around 9:30. If I drink a cup at 9pm I'll fall asleep okay at 9:30. If I dri

For me I've found that it takes a while to take full effect. I normally go to sleep around 9:30. If I drink a cup at 9pm I'll fall asleep okay at 9:30. If I drink a cup at 6pm, I'm going to have problems sleeping.