When does rattlesnakes sleep?

Answer 1

I found that, "The Timber Rattlesnake's year begins in April when the hibernating snakes stir from their long winter sleep and emerge from their communal dens to sun themselves on warm days around its mouth. ... As August draws to a close the cooling nights signal the snakes that it's time to return to their ancestral den for the winter. ... By the middle of September all the snakes are safely inside the den with the newly born young arriving last. Growing sluggish and sleepy they finally enter hibernation and sleep while winter's cold and storms rage outside."

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Answer 2

Rattlesnakes sleep whenever they feel it necessary. During the cold winter months they enter a form of hibernation until the weather improves. During hot and dry periods they may do the same or may sleep during the day and emerge well after the sun sets. If the snake has recently had a good meal it will usually go into hiding and digest the food slowly over a few days and not emerge again until it is time to look for the next meal.

Answer 3

Eastern diamondbacks may use an animal burrow for shelter or simply hide and sleep in areas with dense vegetation.