New Mom Exhaustion- How Are You Coping?

I always love the "sleep when baby is sleeping" advice. Clearly they've never had more than one child! With 3 kids at home, there is no sleep during the day and with a baby there is no sleep at night. I'm pushing through and going on fumes but I try to remind myself it won't last forever, although even that doesn't help those really bad days. DH has duty so he's not home every other day and he's one of those useless at night people so I'm up every hour with Jack. He goes to bed right now at 11 and than up at 4am for the day. Coffee is my best friend! :) I'm hoping that once I start to work out again, I'll get a natural boost of much needed energy during the day! :)