Study to Explore Natural Daily Variation and Impact of Stress in HIV Levels

This intervention occurs over one 24-hour period. Eligible participants will be required to be admitted into a supervised environment for 24-hours arriving no later than 0730. Blood draws will then be taken every 4 hours (0800, 1200, 1600, 2000, 2400 and 0400). Care will be taken to ensure the total blood draws (including the screening visit) stay within Red Cross Guidelines (less than 500 ml every 8 weeks).

"2 visits will be required, each lasting approximately 2.5 hours in the afternoon.~At both visits participants will rest quietly for 15 minutes, then have 3 blood draws and 4 saliva samples over approximately one hour. Participants will also be required to complete short questionnaires about their mood and experience.~At the second visit, participants will also complete some thinking and talking tasks. In addition the autonomic nervous system of the participant's will be monitored throughout the visit."