In you roll after your shift, shagged out. Plod upstairs, step out of your gear, leave it on the floor, don't bother to have a wash, just collapse into bed. She stirs and tries to start a conversation, still half asleep and not opening her eyes. 'Tough shift?'
You, by now seconds from the land of nod, face buried in pillow. 'mmmmm'.
'Enjoy the food?' she ventures, knowing that she's practically lost you for for the next few hours and she can still grab a couple more herself. No reply. Thirty seconds go by. Then you omit the most enormous fart without even stirring.
Thirty more seconds go by.
'I'll take that as a yes then'.
Another minute passes and you're both snoring.