Twenty four subjects within the first year of sobriety will be enrolled. Participants will be undergo an extensive baseline screening procedure. After 2 consecutive in-laboratory polysomnograms they will be treated with either Quetiapine XR or matching placebo pills targetting a dose of 400 mg a night. The treatment duration will be 8 weeks and during the eight week of treatment they will undergo 2 more nights of in-laboratory polysomnogram. All subjects will also receive Medical Management therapy, a standardized psychosocial intervention which is medically-based and focusses on alcohol abstinence and medication compliance.