I know what u mean, I had to have my syrian hamster put down because of an abdominal tumor and then a week later one of my winter whites died after having a stroke. Not to mention my dog dying the day before my hamser from a stroke also. I felt like i had the touch of death lol. My other WW has also started sleeping all day and night. Im sure it must be hard when you cant see exactly why they have passed away. I hope your other 2 are alright