Sleeping On the Job

I have too much going on lately and am exhausted.  Here's a real life scenario that happened at work yesterday between my client counterpart and I:

Me: Do you know whether we've covered the drop-ship process in our deliverables?
Client: Um, let me check our flows...
(A minute passes and I am getting really sleepy.)
Client: Good night Sherly
(Grogg-ily awaking)
Me: Oh!  I heard you...you said...

Client: Riiiight

Apparently, I literally fell asleep while I was waiting for him to answer me in the span of two short minutes!