I crate mine when I go to work or leave the house. I am in total agreement with BDawg. It's safer for your dog and your sanity to have them sleep in the crate while you aren't around.
I agree. I now take Caesar and Cairo to work with me and all they do is sleep. Caesar and Cairo are in a kennel when I am out of the house. There is always an adjustment period where there is a bit of whining, but it is a nice thing to train them to do if you go out of town and have to have them in a kennel.