I've had 4.5 hours of broken sleep in the last 24 hours and have been up most of the night with our poorly baby....I'm exhausted.
He on the other hands gets to spend half the night in the spare room every night for 4-5 hours of uninterrupted sleep and also gets to go to work to escape the physically draining task of looking after a baby all day 
Every time he he tells me he's tired and pulls a 'woe is me' face I feel like saying, "Well I'm a lot more f*king tired than you are!!"
And breathe......