In Iceland and other Nordic countries, it is customary for babies to nap outdoors, even in cold temperatures. Parents believe that fresh air enhances sleep quality and contributes to overall health. 

A study conducted in Finland in 2008 found that children who napped outdoors slept longer and more deeply than those who slept indoors. Parents reported that their babies had better appetites and were more active after outdoor naps.

Low crime rates and high levels of social trust in these countries support the safety of this practice. Parents often use baby monitors to keep an eye on their children while they nap outside.

While this practice might seem unusual to outsiders, it's a testament to the strong sense of community and trust in Nordic societies.