Little sooky whinge post from me but how do you cope with chronic, severe sleep deprivation?

I regularly am getting by on two or three hours broken sleep a night. i know it is normal for babies to wake during the night so what do you do? I feed lying down at night and we have started cosleeping with Miss G which has made no difference to her nighttime antics.

We live an hour from anything so to get anything done, I have no choice but to drive, quite often when I'm barely functioning anyway. And when we are at home, even trying to rest when the girls rest doesn't really work as trying to get two babies to have a decent sleep at the same time during the day is not really conducive to sleep for me.

How do you do it? I feel like horrible cranky mummy far too often