Does drowsiness as a defilement only refer to a psychological state of mind? I know that emotions manifest also as physical phenomena, but how do I distinguish between physical exhaustion and psychological defilement? If I am done with my job or school I'm feeling sometimes exhausted. How do I know if I have this defilement in me? Now of course if I ate a lot then it's clearly a defilement. Just for convenience I was thinking that the next time I'm feeling physically exhausted I am going to meditate even if just for 5-10 minutes to give myself the chance to have a sense of achievement and well.. maybe the sleepiness disappeared by then. Any thoughts or sutta references? (I am aware that the Buddha advised to combat drowsiness and if everything fails one can take a nap)

I would really like to ask here: how accurate is [AN 9.20 – Velāma Sutta](http://www.accesstoinsight.org/tipitaka/an/an09/an09.020.than.html) ? * Is stuff exaggerated in places ? * If you give all the stuff Velama gave, wouldn't you get at least a little more than a "whiff of a heart of good will" while doing so - more moments of good will than just one ? I'm not sure I remember all I want to ask about this sutta so if you have anything to add that is welcomed.