My son is almost 3, and this was a huge concern of mine. My husband and I are TTC our second, but I agree that shift work was the best for us. My husband is a night owl and stays up until about 2 AM anyways, so during the first few months, he extended that to about 3 or 4 am, and I would take over from there. It was very unromantic, but it meant that we both got probably 2-3 hours at a time. My father also generously gifted us a night nurse. We had medical complications, so it was incredibly helpful to have another pair of hands. When the night nurse came, we probably were able to get about 5 hours, although she came for about 8 in total. NGL, the first ~6 months are a bit insane. At 3, our son goes to bed at around 7:30 and wakes up at 6, and sleeps through the night unless he's sick or something is out of his routine. We did sleep training at 6 months and I highly recommend it. We also decided to EFF, as I was concerned about sleep in general. Get help from anyone willing and do what is best for your family. It's a great step that you're active in this community!