Ruthie goes through spurts with hers. Some times she will have them every night for a week(she only gets hers a night) then it stops for 2-3 months, then they start up again. It's exhausting. I drove myself crazy between the vet and doing online research trying to find out about them, when I came upon EBN. It's nice to know you aren't alone. I find with Ruthie, giving her something hard to chew on, like a carrot helps get hers to stop.