HIV-positive individuals on antiretroviral therapy(art) have detectable cell-associated unspliced (ca-Us) HIV rNain cD4+ t-cells from blood which varies with time. additionally, werecently showed that circadian transcription factors, circadian Loco-motor output cycles Kaput (cLocK) and brain and Muscle arnt-likeprotein-1 (bMaL1), bind to the HIV Ltr and increase HIV transcrip-tion. We hypothesised that circadian rhythms exert transcriptionalcontrol on latent HIV.