There are quite a few medications available today to help people with sleep problems. Ambien CR is just one medication.
Others include: Ambien (not the CR), Lunesta, Rozerem, Sonata, Restoril, Halcion, Prosom, and Placidyl to name the most popular ones.
Ambien CR does NOT work for everyone. So make an appointment with your doctor and discuss switching to an alternative. Lunesta and Rozerem are each fairly unique in how they work so these should definitely be considered.