And that brings us back to the patriarchy. DP's job means that he's out of the house around 7:30-8, and back again about 6:30 if he's lucky (once or twice a week he'll be late).
As soon as DS1 wasn't being fed to sleep I handed the bedtime over to DP - which despite some protestation at first, has been his job ever since.
Should we ever split (not likely, but obviously you never know) I want him to have a fighting chance of getting equal custody - and if he never did anything for the kids then that just wouldn't be as likely because they want to give the kids some continuity.
This is what actually silenced a weird MRA type I accidentally spoke to on Facebook - I stayed reasonable, pointed a of study that showed that the majority of mothers bent over backwards to facilitate contact (was from Sussex if I remember rightly - questioned the kids of separated couples), that the way to ensure you get to look after your children after divorce, is to look after them before divorce etc.
I don't even think that most of the time it's intentional on the part of the men - patriarchy again - they just go out to work, and leave all the kid stuff to the mother, and that lackadaisical behaviour comes back to bite them at an already difficult time for everyone, when no-one is really thinking straight.