sleep deprivation

when i am sleep deprived- not like a bad nights sleep but more like a birth interrupting two nights of my sweet slumber- i get nauseous and head-achy. then it is amazing how i bounce back to normal (or so it seems) after a cup of coffee. BUT then 3pm creeps up and i CRASH!!! irritability gets me through the evening morphing into conversational delirium. my kids may think i am a poopy grouch on the verge of dementia but it was all worth it.