All of these have happened to me in the last four weeks.
You know you're sleep deprived when...
1) You look all around the room trying to find the switch to turn off that mysterious light when you realize it's the sun coming up.
2) You hear the baby crying on the monitor and try to hit "snooze."
3) You try to convince your husband that the sweat pouring from your brow in the middle of the night is actually your milk coming in. (I really thought I had milk coming out of my forehead...John was smart enough to not try to argue with me.)
4) You think the baby has stopped crying only to discover that you've simply left the room.