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.
Many people describe the dens and snakes as smelling like cucumbers; others describe the scent as skunklike, while some argue that the dens smell like decay. Klauber himself suggests that rattlesnake musk is not particularly pungent and he does not believe humans can smell dens from afar.