 This proposal aims to assess whether a switch from Atripla to Stribild for 12 weeks will be associated with reversal of sleep and cognitive disturbances. Demonstrating changes upon withdrawal of drug and substitution of a drug regimen not known to have an impact on sleep and cognition may represent the best option to determine whether use of efavirenz is associated with effects on sleep and cognition beyond the immediate period following initiation of drug. 