Context: married 10 years, have an 8yo, 4yo and 1yo. Youngest is a terrible sleeper, so we cosleep and I do all the night wakes as I can settle her quickly and she sleeps longer periods when I'm next to her. It works for us as dh can get a night's rest / listen out for the others, and then takes over early so I can get some rest.
Issue: last night our 1yo was unusually unsettled, sleeping in 20 minute chunks and screaming for half an hour every wake from 7pm-1am, I think she had an ear ache as she was pulling on her ear and she seemed in pain. We gave her calpol but it didn't make a huge difference.
Just after midnight I asked DH to take her for a few hours so I could get some rest, as I knew I'd be in for a rough night. DH who was up faffing on his laptop said "yes sure". He managed to get her down in her room, then came to bed and went to sleep. 1yo woke up at 1am, and DH woke me up telling me to go to her, which in my sleepy state I did. I brought her in and checked the time, and asked him why he isn't helping. He got instantly defensive, telling me he got her down and went to bed (yes I see that), and didn't look at the time when he heard her. Made no effort to get up and help while I was up rocking her to sleep. I said that's not what we agreed, and he said he didn't understand what I had meant (I literally asked him to be responsible for her for a few hours while I slept, and he had agreed). Convenient. I said he needed to go and sleep in her bed (toddler bed, single mattress), while I sleep in our bed with the baby, so I can hand over in the morning and know he's had some rest. After some protesting about that (he needed a blanket, i suggested he finds one - there are loads), he went. Baby went to sleep and only woke briefly twice between about 1.30 and 7am. I handed her off to dh at 7.15, thinking DH had had a solid 6 hours uninterrupted sleep.
My AIBU: DH just told me now that he is so tired as he didn't get to sleep until 3am. I asked him why not, and he said "our argument put me in a mood and I couldn't sleep". So apparently I am at fault for this. While I looked after our sick child, I was apparently also responsible for my fully grown husband's poor sleep hygeine (going to bed late for no reason, looking at his phone while in bed, getting worked up that I was annoyed with him for not helping). AIBU to think it is a) not my fault he is tired now, and b) not really on for him to be cross at me after I did all the work last night with the baby except for the 20 minutes he had her for at midnight?
Oh and ...* *It is not the first time he's been tired after not looking after himself - he falls asleep on the sofa for half the night and then complains he is tired the next day (after I've done the nights with the baby), and other times watching tv on his phone until really late. If I am tired, I go to bed, and if I choose to stay up, I certainly don't get cranky at other people for being tired. Meanwhile, I'm exhausted after hearing the baby scream for hours on end and getting a very broken night's sleep (on top of 15 months without a full night's sleep). I know it's not the tired olympics, but it feels pretty shitty.
What now? I am in the room with him, both of us wfh. I didn't reply to him saying it was our argument, worried I'd say something I'll regret. What would you say?