> When Samson stayed with the Hadza, he described common parenting practices in the US, such as encouraging babies to sleep separately from their caregivers. "They looked at me like I was insane," says Samson. "They were like, 'Why? Why? Why?'… I felt bad almost asking the question."

We had our twins sleep with us for about a year. They slept better, we slept better. During daytime naps, they slept in their own room and beds so that was not totally foreign to them when we switched them to sleeping there at night.