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1.
when you wake up in the morning and look in the mirror to find that your face has not woken up yet.
I woke up 20 minutes ago but I still have sleep face!! my eyes are all droopy and i have blanket face

My sleep face needs to wake up! I have to go to class

He told me my sleep face looks like a sad turtle
by mahsita69 December 07, 2009
 
2.
The face one has when driving home after eating too much caramel indulgence cake.

Also refers to a permanent facial condition caused by over using the popular narcotic, "Sleep".
Caramel cake was a bad choice, should have went with the molten volcano vanjmoresdf? cake instead. Now I have to drive all the way home with total sleep face.

Or

Check out that chicks sleep face, looks like it has been cold boiled for hours!
by Fantana2012 June 04, 2013