Do people think I don’t WANT to sleep?

I’m just venting I guess. I have an almost 2.5yr old that has never slept through the night. He had bad reflux as an infant but even as that cleared up he’s always had trouble getting to and staying asleep. Over the last few months we’ve finally found out the dude has not only eczema, but also a dust mite allergy and glue ears etc. but even finding all,this out hasn’t resulted in him sleeping better consistently, in fact it’s really just added a level of hyper vigilance and routine to our lives. My husband and I STILL do our newborn roster of alternating nights - I’m on tonight so he can sleep, he’ll do tomorrow night. I’m exhausted. I’ve struggled with PPD since having him, which is so sleep related. It’s affected my work, my health, my weight, my social life - I’m just a shell. And you know what everyone says… Prioritise sleep! Make sure you’re getting enough sleep! Sleep at least x hours a night! Fucking HOW? It’s 2:30am, I’m up because he won’t sleep. I haven’t slept. What should I be doing right now to prioritise sleep?