It is common practice for parents in Nordic countries to have children as young as two weeks old sleep outdoors alone even in the winter. The rationale is that the fresh air (rather than a room full of other children) will reduce colds and coughs.

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9 Fun Facts About Sleep

On the outside, we look relaxed, peaceful, and unaware. But what really goes on while we sleep? We spend nearly one-third of our lives—approximately 25 years—in a state of sleep, yet we remember little to none of it. When you hit the pillow, your body doesn’t turn off. It begins an intricate cycle