Here's How Your Evening Coffee Is Ruining Your Sleep

We’ve all been there: you’ve devoured a three-course meal, it’s 10pm and the waiter asks if you want a coffee. The rest of the table is ordering cappuccinos so you do too. Fast forward three hours and you’re lying in bed with eyes wider than a set of saucers. Why does this happen? Because caffeine interferes with the action of adenosine, a compound found in the brain which slows down nerve activity and makes you sleepy. As the day progresses, levels of adenosine