Provided herein are 19-nor C3,3-disubstituted steroids of Formula (I): and pharmaceutically acceptable salts thereof; wherein, , R1, R2, R3a, R3b, R4a, and R4b are as defined herein, and A is a carbon bound substituted or unsubstituted 5-to6-membered heteroaryl ring as defined herein. Such compounds are contemplated useful for the prevention and treatment of a variety of CNS-related conditions, for example, treatment of sleep disorders, mood disorders, schizophrenia spectrum disorders, convulsive disorders, disorders of memory and/or cognition, movement disorders, personality disorders, autism spectrum disorders, pain, traumatic brain injury, vascular diseases, substance abuse disorders and/or withdrawal syndromes, and tinnitus.