The Sleeping Tree is a strange leafless tree found in Whiterun Hold in Skyrim. It grows in a misty pool beside a small cave now named after the tree. A giant encampment also named for the tree surrounds it. Several legends exist on the origins of the Tree. Some say that a piece of rock was blasted from Red Mountain during the Red Year and landed in Skyrim, and the Tree grew from the resulting crater. Others say that it grew from a spore which fell from a "floating island", referring to Umbriel, in which case the Tree is one of the Hist of Umbriel.
Sleeping Tree Sap
Sleeping Tree Sap is considered a legal drug in Skyrim and is highly valued for its ability to make people feel much healthier for a time, although side effects include temporary slowness and blurry purple vision. A spigot was installed on the Sleeping Tree in Whiterun Hold to harvest the sap, and the Khajiit trading caravans have been known to pay highly for samples.