Top excuses if found asleep at your Desk...

"Oh, Man! Come in at 6 in the morning and look what happens!"

"This is one of the seven habits of highly effective people!"

"This is in exchange for the six hours last night when I dreamed about work!"

"Gee, I thought you (the boss) were gone for the day."

"They told me at the blood bank this might happen."

"Oh, Hi, I was trying to pick up my contact lens without my hands."

"This is just a 15 minute power-nap like they raved about in the last time management course you sent me to."

"Whew! Guess I left the top off the liquid paper"

"I was just meditating on the mission statement and envisioning a new paradigm!"

"I was testing the keyboard for drool resistance"

"It worked well for Reagan, didn't it?"

"Just pacing myself for the all-nighter tonight!"

"I was working smarter-not harder."

"Auggh! Why did you interrupt me? I had almost figured out a solution to our biggest problem."

"I'm in the management training program."

"Someone must've put decaf in the wrong pot."

"Boy, that cold medicine I took last night just won't wear off!"

"Ah, the unique and unpredictable circadian rhythms of the workaholic!"

"It's okay... I'm still billing the client."

And the #1 response if found asleep at your desk:
"...and I especially thank you for my excellent boss, Amen!"