We lost Math (2003-2016) last night to advanced HCM with complications, I won't get in to details because it's just too sad for me right now, we are devastated. He was a huge part of our family and will be forever missed. I was wondering if anyone here has dealt with cat grief before? Our surviving cat family member, Carbon is very upset. I tried to comfort him but beside extra cuddles I am unsure how to help? He is having nightmares (some angry meows in his sleep), howling, pacing, and a general lack of sleep in our house of multiple members of the household.