40 Winks

Why is it that around 2:00 pm I get so sleepy? I see this happen mostly when I'm not doing anything, like sitting and maybe doing a little surfing. Next thing you know I'm yawning and rubbing my eyes and looking for a corner to crawl in to get 40 winks. This doesn't happen for long or very often, but long enough to make me feel uncomfortable. Twenty minutes later I'll be fine. So time to wake up cause here comes the next class.