People can clench and grind without being aware of it. It can happen during both the day and night, although sleep-related bruxism is often a bigger problem because it is harder to control. There is some disagreement about the cause of bruxism. Daily stress may be the trigger in many people.
The Blue Jay has a very large range, extending to around 6,700,000 square kilometers. It prefers a boreal temperate, subtropical, tropical forest ecosystem and is native to North America, Saint Pierre, and Miquelon.
Nevada designated the mountain bluebird (Sialia currucoides) as the official state bird in 1967 (also the state bird of Idaho). A member of the thrush family, the mountain bluebird lives in Nevada's high country and sings with a clear, short warble.