What Is Cosleeping (co-sleeping)?

It's the practice of sleeping with your babies or children.

Advocates argue that this is the "natural" way of raising and treating babies and young children. The idea of everyone sleeping in a separate bed is relatively recent, especially for children.  Among poor or rural families in Britain, until the middle of the 20th century, it was still very common for young children in a family to bedshare with each other if not with their parents as well. Waris Dirie, a supermodel born in 1966 and who was raised in a nomadic Somalian family, describes going to bed as diving into a tangle of her brothers' and sister's arms and legs to get warm.

Advocates argue that this is reassuring for babies to sleep next to their parents, and cruel to impose on them separate sleeping conditions.

Nowadays we have a very firm idea of getting a good night's sleep, though.  It is also official advice that parents not have young babies in their beds, to avoid possible injury or suffication.  Co-sleeping proponents argue that co-sleeping with babies can be safe, if practised sensibly.