From here:-
http://jakeandsarah.blog.co.uk/2008/04/03/if-i-could-have-any-super-power-3992164
I would be a 24-hour insomniac and would never, ever sleep. That way I won't get moody getting up in the middle of the night to attend to my child and also I could have more time tidying the house, cleaning every corner so it was spotless as I'd be bored from being awake all that time! 
