To stop waking him up?

Do you really think having a kid with this man would be fun and improve your life?
Baffling.

I had a similar thing... Amazingly he would always get up for work on time, but slept through alarms otherwise. I refuse to wake him now. He can set 10 alarms.
If he misses out on fun with us that's his problem.

Do not have a baby with this man.

🚩🚩🚩🚩🚩🚩

There’ll be a reason he’s sleeping through alarms, he’s not ready to wake up. If he was serious about waking up at a specific time, he’d go to sleep early enough to make waking at the specified time a realistic possibility.
If he was a teenager I’d be encouraging him to work out how much sleep he needs and then to make sure he gets it. DS2, (28) sets an alarm to remind himself to get ready for bed so that he can wake in time to work at the right time.
Presumably your DP is not a teenager and do should be able to sort himself out. I think you should refuse to wake him as it sounds like it leads to arguments. You can tell him that and tell him he needs to do his own adulting.
If it then transpires that he doesn’t get up for work in time, that’s on him.

Yeah he can set an alarm like other adults do, even my teenage daughter sets her own alarm!

This all sounds incredibly unattractive. You are not his carer, MH or not he's a grown-assed man who needs to take responsibility for himself. How do you not have the ick? Do not breed with him.

Leave his sleep up to him. It's not for you to decide how much he gets or to wake him up

What would he do if he lived by himself? What are his MH problems? Has he sought help? It sounds like you're his mummy.

Oh and yes, please don't have kids with him. MH issues or not, if he can't even get himself out of bed on time, what use do you think he'll be with a screaming newborn in the house?

Don’t have children with him. He is not interested in a parenting partnership.

He is the type to create resentment in his partner. Are you on Mumsnet because you can see resentment in your future? Not necessarily the sleeping business (ffs, don’t have kids with someone who thinks being awake is the woman's job) but there will be other things about him.

If you stay with him, resentment is your future.

He sounds like a teenager and you want to have kids with him? Honestly don’t do it or you will be on here with AIBU my husband won’t get out of bed to help with the children threads and there are quite a few.

Don’t have kids with him. He needs to grow up.

Yes, do not have kids with someone who (a) relies on you to wake him up every day (b) is then annoyed when you do so.

You don’t need to spend your life facilitating other people’s mental health accommodations, and being resented for doing so. There is more to life than this.

Give the responsibility back to him. It's not for you to wake him or to research different alarm clocks etc. it's for him to find a solution to this problem.

Think extremely carefully before you have children with him. The man-child vibe is irritating now, but will be intolerable if you have kids in the mix too.

If you want kids with him you really should stop mothering him and start expecting him to be a partner, because if he can’t then you should not have kids with him. How about you say you hate that he asks you to take the effort to do something for him and ignores you every time, and if you follow up he yells at you. Ask him if every time he bought you flowers you said yeah whatever and threw them in the bin, would he keep buying you flowers? And even if he turns around and says sorry say so you should be, I’m still taking a two weeks break minimum from waking you because I’m not your mum and you made me feel like shit for doing you a favour you asked for. Why don’t you cook dinner and I’ll thank you nicely like people should when someone does something for them?

Id explain the issues when he's up & functional and that you aren't going to be waking him in future as it doesn't work and wastes you time so he needs to find alternatives that do. He should consider why he so tired in the morning, is he having late nights so sleep deprived, poor sleep quality or possibly sleep apnea if still doesn't feel refreshed after a long sleep or another health condition at play.

I have a delayed sleep rhythm and have always really struggled with waking up early, I wish my brain could fall asleep as easy at night as it can in the morning. A couple of times I've even been rude to someone waking me and it's caused them to sulk, while I'm unaware of this reason as wasn't fully conscious to recall the event.
I now have smart bulbs so they are set to 'sunrise' so hit full brightness just after Alexa, plays music so I'm bit more with it by the time my alarm goes. If I ask people to wake me it's as a back up. With the Alexa speakers you can set them to do a morning routine or give reminders like ' Get up you lazy twat!'. I usually wake fairly easily to noise but i'd get him one of those vibrating alarms.

This would annoy me, i would start waking him up with a glass of cold water ... bet he would wake up the alarm in future.

How does he get up for work in time?

Yes I agree with this. I always set several alarms to get me up.

OP, he is an adult and shouldn’t be asking to be woken, esp if he’s going to be grumpy about it!

I wouldn’t want to have kids with him until he gets some help for whatever issues are making him want to sleep late either.

I can sleep through an alarm, especially if I've had a bad night

So I set 3 at 15 minute intervals. That works

And because he's relying on you his subconscious is relaxed about it

I'd said him once and then leave him. If he didn't want a vibrating watch try something like this which clips into the pillow.
https://www.healthandcare.co.uk/dvt-and-travel-health/sonic-boom-vibrating-travel-alarm-clock.html

Why is that your problem? He's a grown up - if he lived alone he'd have to find a way to get up on time.

I wouldn't make a grand statement about it but I wouldn't go back and wake him again from now on. If he asks you to wake him at 9.30 but doesn't get up then, leave him. This means getting on with the day yourself, including going out without him if that's been the plan. Make sure it's him losing out on whatever he wanted to be up for, but not you.

Has he tried a fitbit type watch where the alarm vibrates on your wrist? If nothing works he needs to see a sleep consultant, or go to bed earlier so hes not in the very deep stage of sleep still in the mornings