You might receive more elaborate answers in /r/AskAnthropology from scholars who have experience in nomadic groups.

That said, I can address a few points with the question. Even though we spend a tremendous portion of our life asleep, there is a relative lack of scholarship on the anthropology/ecology of sleep. If you are interested in reading more, Carol Worthman is responsible for most of what we know about comparative sleep patterns, though I don't think she has published very much recently. This Discover article provides a good introduction.

Briefly, the modern U.S./Northern European sleep cycle and general sleep setup is not a human universal. We reasonably expect to sleep either alone or with one partner, and sleep uninterrupted for six to eight hours each night. We sleep on an elevated platform, with extensive bedding, generally in an isolated, dark, quiet room. When viewed through the lens of human history, our sleep is abnormal.

Very generally, sleep in modern foraging societies is a more fluid state than in our culture. People sleep when they are tired throughout the day, and don't limit their rest to strictly at night. When tallied together the average number of hours slept equals our own, just dispersed over 24 hours.

I'm most familiar with South American foragers, so I will focus on these groups. When Amazonian foragers sleep at night many groups, like the Ache, will all pile together on the floor and make sleep a social activity. Every age, male and female, and even pets will come together for the night. At any point throughout the night some people are sleeping, others are telling stories, of course there is some procreating, some are tending to the children or pets or to the fire, someone is eating or leaving to take a bathroom break. Over all the human noise is the nocturnal environment noise, which can be quite loud. Basically, it is a sensory-rich environment with a constant baseline din.

A child crying would be a routine occurrence for these groups, and in a culture where sleep is more fluid there would not be our response of frustration at an interruption. This polyphasic sleep is the cultural norm, and several anthropologists report that foragers find our sleeping patterns, with the family split into different rooms and children isolated from their parents, cruel and insensitive. Foragers expect to be woken up at night. Polyphasic sleep is vital to their social interaction, family roles, and overall culture.

I've read this before in a variety of books, and although it references specifically Native Americans it provides an answer for at least one corner of the globe:

"When a baby cried, she held his nose with her thumb and first finger, holding her palm over his mouth, until he stopped. No one, not even an infant, could be allowed to give away the tribe's position, not want an enemy might be lurking nearby."

Source: Crazy Horse and Custer: The Parallel Lives of Two American Warriors By Stephen E. Ambrose

Edit: clarity