What do you do when you are so dead tired but you still have a ton of work to complete? Any advise on how to juggle work, deadlines and motherhood?

Normally I will rush to do my work whenever baby is asleep or when I have some help i.e. parents looking after baby. Or I will stay up for one night to do what I must finish so that I don't have to break into parts to do as I will get lazy and drag it longer.