I know I probably ABU but would love some perspective. 
I am still irritated by how my DH behaved when our second child was born.
In the week or so coming up to due date I mentioned to DH he really needed to pack in drinking in the evenings and late nights, as if I went into labour he would need to be able to drive.
DS2 arrived the day before due date. I went to bed at about 10:30 and woke up at 00:30 to my waters breaking. DH nowhere to be seen. Once I'd dealt with waters I went to find him and low and behold he was still up and having a beer! We finished getting the last bits of my hospital bag together and then I sent him to bed. Laboured on my own in the house for as long as possible, but had to wake him around 2 hours later as I thought things were progressing and we needed to contact FIL to come and look after DS1.
Eventually headed to the birth centre at around 4am. In the throws of labour I forgot to ask DH how much he had actually drunk and he drove to the birth centre without a conversation about whether he should drive or not (only 5 minutes away but that's not really the point!). After the event he told me he had only had a couple of cans and would be fine to drive but who knows?
I gave birth a couple of hours after arriving at the centre and then we were discharged before lunchtime. DH was fine during the labour, didn't do much, but I didn't really need him to as I prefer to just be left alone when in pain.
When we got home he immediately started complaining how tired he was. How he hadn't had much sleep, etc. etc.
Anyway, a bit later he disappeared off for a nap. I was a bit incredulous at the time, but he was adamant I had more sleep than him (10:30-00:30 so around the same two hours by my count)... and then I'd GIVEN FUCKING BIRTH!!!
I then didn't get more than 2 hours sleep in a row for the next two years as it turns out DS2 was allergic to sleep. So I may be a bit bitter. 
I don't dwell on this often, but whenever I think about the day DS2 arrived I always end up thinking about this and feeling a bit annoyed again. Also when we've discussed it retrospectively DH is still adamant I'm unreasonable for thinking the way he acted was, well, dickish. And that it's unreasonably for me to say that so close to my due date he shouldn't have been staying up late drinking, he should have been getting an early night and expecting baby to turn up at any time (DS1 was a bit early so I didn't have form for going wildly overdue). Also he is still adamant that he needed a nap more than me. 
I think I'd feel better if he'd just acknowledge that he was in the wrong. But he won't!!
I know I need to let it go really, but AIBU for still finding this irritating?