working moms + no sleep?!

S
My LO is 9 almost 10 weeks and is still not sleeping through the night she wakes every 3 hours and we sleep in till about 11AM, I go back to work in just 2 week so I won't have that luxury to sleep in with her anymore. How do y'all working mommas do it besides a bunch of coffee during the day?! I'm so worried I won't be able to function during the day and work!