“The best time to drink coffee is the mid to late morning, usually around 9:30 to 11:30 a.m.,” Dr. Raj Dasgupta, a ...

Here’s why. You may feel sleepy after drinking coffee because caffeine blocks adenosine receptors in the brain. Adenosine is ...

Dr Begeti reveals the science behind your favourite brews. 1. Caffeine is a psychoactive stimulant It blocks adenosine receptors in the brain, reducing tiredness, boosting alertness and mood by ...

Caffeine blocks adenosine, a brain chemical that helps promote sleep, says Dasgupta. "Normally, adenosine builds up in the brain while awake leading to sleepiness. If you drink coffee too late ...