Sleep!!

Sounds like something is wrong with his mental or physical health or he is avoiding responsibility. I would be upset.

Hey so my brother was like this and he was late diagnosed as type 1 diabetic. You have every right to be upset to be handling the responsibility alone for so long in the day, but that amount of sleep is not normal and he needs to get checked out.
It would be one thing if he was staying up late and slept in bc his body needed the 8-10 hours. But 16 hours is a red flag

It’s not okay to sleep 16 hours a day, baby or not (don’t bean soup this - I mean as a physically/mentally well person etc)

He needs to go to the doctor and get checked.

So my husband became like this due to a iron deficiency which he had treated... 6 months later he was diagnosed with leukaemia, send him to the doctor ASAP!

This isn't normal for anyone. I would urge him to seek medical care to rule out anything health wise.

Depression or a health issue possibly that needs to be investigated, Is the only reason mine would “think it’s okay”.
After working 7am-6pm weekday my husband willing by choice, wakes up at 5am EVERYDAY

His "needs" are being met and yours aren't, and instead of talking to you and working it out, he's dismissing and name calling you. Some things are worth arguing about, just make sure you don't falling into the trap of 'who is getting more sleep than whom'. The job thing is a distraction. I'm sure you're willing to hear his concerns and take into account whether being sleep deprived puts him in physical danger or extreme discomfort. Is he willing to hear that about you?

You both need sleep, but what you really need is to be able to do is have a conversation about what you need that results in a workable compromise without him minimizing or dismissing your concerns. You have resources and there are lots of ways to solve problems, but he needs to value your concerns and wellbeing enough to keep talking long enough to reach an
agreement, and then uphold his end of it. gl 🍀