Dogs sleep more than us, but they wake more frequently than we do. How much and when they sleep depends on the level of activity in their environment. A dog living as a pet in the home is likely to sleep more than a dog that works for a living, like a search and rescue dog or a dog working on a farm.
In the colder winter months, some rattlesnake species enter a period of brumation, which is dormancy similar to hibernation. They often gather together for brumation in large numbers (sometimes over 1,000 snakes), huddling together inside underground rattlesnake dens or hibernacula.
If snakes enter to find prey or shelter: Some snakes hibernate in older houses, cellars or crawl spaces with dirt floors. The presence of shed skin may indicate that a snake has taken up residence, or the snake may have used the house/cellar as temporary refugia while it shed its skin.