The definition of
Lethargy.
1. Your yawning frequency is more than 15 times/minute, coupled with the secretion of tears. And the yawning is involuntary as opposed to yawning due to boredom.
2. You feel like sleeping the day away. Or the week, or forever, like sleeping beauty.
3. You trundle sluggishly to that favourite secluded corner of yours in the office to catch 40 winks. Or at the gents/ladies.
4. You either nod or grunt in a conversation while trying to stiffle that big yawn.
5. Your thoughts are incoherent and coming up with five definitions for lethargy is a major accomplishment.