Cleaning pump parts

I'm really struggling with feeding my daughter and she is losing weight. So I've been pumping a lot lately and it's exhausting. My question is, is it necessary to wash my pump parts after every pump session? I have to pump every 2 hours, feed that to her. Supplement with formula and offer the breast, then repeat. Overnight there is just no time to do all of that and wash my parts and get any sleep at all before 2 hours has passed and it's time to do it all again. It would help if I didn't have to wash the parts and could just reuse them for the whole night so I didn't have to get out of bed. Please help a mother out with any tips.