"insomnia is one of the tag alongs with my bi polar. my doctor prescribed every medication on my group health formulary to no avail. i either had radical side effects or they only worked for 2 to 3 hours. ambien cr is a blessing. i actually now get at least 5 to 6 hrs of sleep a night. for those of you with bi polar, you understand sleep is crucial to preventing mood swings. the only problem i have experienced is ambien tends to build up and quit working every so often so i have clonazapam to use for a few days until the tolerance wears off. thank god for ambien cr."