Overall I've really enjoyed being a parent, but poor sleep has been the hardest part. At times we've both been so tired that we weren't able to think clearly about how to fix the problem, which can be very tricky. We've figured this out more over time, however, and sleep has improved with each successive kid (n=3). Here's the main things that have worked for us, all in one place.

Note that kids and parents vary a lot: our three kids are different from each other, and your kids likely even more so. I'm hoping that many things on this list will be useful to many people, but it wouldn't be surprising for several of them to be a poor fit for any individual family. I've ordered them roughly down from the ones that I think are most likely to work for anyone who tries them. Perhaps unsurprisingly this is also roughly in the order of youngest to oldest; my impression is kids diverge more over time as their personalities come out.

Sleeping in multiple rooms. If the baby waking up means only interrupting one parents sleep that's about half as much sleep deprivation.
Blackout curtains. Small children typically wake up with the sun, which means you're up to. If you can keep their room solidly dark in the morning by blocking out the sun you can shift their schedule to whenever is most convenient for you, typically a later waking.
Using a Snoo automated bassinet. It gently rocks the baby and shushes them back to sleep when they wake. We used this with our youngest for the first six months. It worked very well, and automated almost all of the helping babies fall back asleep that I needed to do with the older two. We weaned her off it much more gradually than they recommended, with first weaning mode (stops rocking after the baby is asleep) and then running it without rocking.
Sleep training. At some point they no longer need to feed as often, but either don't know how to fall back asleep on their own at the end of a sleep cycle or would enjoy getting a cuddle before going back to sleep. I wrote about our experience with our oldest, and how her naps got immediately better. With our youngest, at 15m, we've recently dropped the last night feed, and are in the process of teaching her that she needs to go back to sleep on her own the whole night.
Letting kids know when they can get up. When kids are a bit older, they'll often wake up near th

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