Cats are social creatures and need interaction with other cats or humans. You may consider asking the caregiver to take your cat to a pet daycare center for playtime during the day. Or ask the caregiver to spend some time entertaining your cat so s/he won't feel lonesome. If you've hired a pet sitter, s/he will spend time playing with the cat. Since cats sleep close to 18 hours a day, this doesn't present much of a problem.