No if course they don't, neither did ours (youngest still doesn't consistently at 7yo)...both our kids are ND. Key for us is division of responsibilities. One has them in the evening/night, the other takes mornings. Switch around however it fits your everyday schedule requirements. One can covee afternoons if adult naps are needed as well.

This still allows for pretty consistently getting a decent amount of sleep. If you're a single parent, then yeah it's fucked.