My SO won’t wake for the kids

I have two beautiful babies, one toddler and one newborn, who share a room with me and my SO.

My SO is a deep sleeper and it hasn’t been too much of a problem until our second baby arrived and now since we’re both exhausted he almost sleeps even deeper than before

The problem is 1) I’m still recovering 2) I’m dealing with postpartum emotions and 3) I’m just plain tired- I need help!!

I can’t wake him up without trying 10 times and then by the time he wakes up it’s by me basically yelling at him that I need him to get up! Then he’s upset because he’s half asleep not sure why I’m so upset, and I’m upset because I’m beyond exhausted and emotional and feeling guilty because I just want to be able to wake him up sweetly and I just want him to help me with the kids at night

He’s never actually upset with me for waking him up it’s just in his half asleep stare he’s a little grumpy- he always feels bad in the morning and is trying also to find ways to wake up but so far no luck

We just want to both be able to get up when our babies cry and even sometimes let him give our newborn a bottle instead of me having to feed her.

If anyone has any ideas on how to either “train” his brain to wake him up when baby cries or I need him or just ways for him to not sleep so deeply we would really appreciate it, things have got to change