 2. Individuals with any current Axis I psychiatric disorder as defined by DSM-IV-TR supported by the SCID-IP that in the investigators judgment are unstable or would be disrupted by study medication. Disorders that are stable on psychotherapy or pharmacotherapy will not be exclusionary. Individuals will be permitted to take prescribed zolpidem and zaleplon or other medications for insomnia if there is no evidence of dependence on these substances. 