When surface temperatures rise to a comfortable threshold, they emerge. For a while they bask in the sunlight, crowded like bronzed tourists on the Costa del Sol.

当地面温度升到舒适的临界点时，它们就涌出来，像在太阳海岸晒成古铜色的游客一样挤在一起，在阳光下晒一会。

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Getting comfortable when you sleep is important because a lack of sleep can cause joint inflammation and lowers your pain threshold, experts say.

WSJ: Find the Perfect Sleep Position