A security guard gave me advice on how to study well

While waiting for the water delivery boy outside my apartment, I was reading my notes, hoping to cram as many information as I could. After five minutes, the security guard greeted me, went up to me, and asked, "You have an exam tomorrow?"

I sighed. "Yes. A hard one."

"Know what? It's better to study in early in the morning—around 4 am—when your mind's still fresh," he said. "You see, I used to do that, and it worked for me."

I thanked him. I went back to my room, amused. The advice was a good one.