Hard painful boobs

Jade • Mommy to Rylee 2-3-16. To be married 5-29-16
My baby is in the NICU. I'm strictly breastfeeding for the first 6 months of life. But since she's in the NICU I don't pump at all through the night I'm just way to tired there so much going on. But I'm waking up with the hardest sorest boobs ever it's almost like I need to get up and pump at least once. I pump at 12am then go to bed and wake up at 6 to pump in the morning. Will this ever go away? What happens when my baby comes home and sleep through the night? Will my boobs get used to it?