Colleague: Don’t you feel sleepy after long hours at night?

Me: You see, we all have 24 hours in a day. Some of us sleep 9 hours, some of us sleep 5. These 4 hours is what really makes the difference.

Colleague: True. But you have to know how to use them properly.

Me: But that’s already a different topic, right?

Colleague: True. Good night.