Is it worth the discount!?

So back in the beginning of October I started a job at Old Navy.  It seemed like an ideal job because they were willing to work with my schedule.  I basically go in to work 5 times a week from 6am-8am to clean the store.  When I first started everything was fine, but now the longer I do it the more sleep deprived I am becoming.  Norah wakes up every 2-4 hrs which would be fine if I could sleep until 9am with her.  Instead I have to wake up at 5:30 to feed her before I go to work, and then I get home at 8:20, feed her again and then she is awake.  On top of being sleep deprived cleaning isn't very fun either.  And I just keep thinking I got a college degree so I could take out trash, mop floors, and scrub toilets!? This job is also the reason I didn't get to go visit my family for the holidays, I had to work a black friday shift from 5am-3pm.  The only reason I've stayed as long as I have is for the discount! I get 25% off at Old Navy and 50% off at Gap and Banana Republic!  This has been nice since I have a little bit of a shopping addiction, especially with buying clothes for Norah. So my question is, is it all worth the discount?