SAN FRANCISCO -- It's possible the amount of sleep you're getting and the stress you're under could impact your COVID vaccine, meaning the strength and durability of the vaccine may have more to do with you, your body, and your lifestyle than you expected. UCSF professor of psychiatry, Elissa Epel, and a team of researchers are recruiting for a study to examine how stress, age, and sleep, affect the immune response with the COVID vaccine. "What we know from the flu vaccine is that stress, particularly bereavement stress, caregiving stress, really major chronic stress, dampens the immune response," said Epel, who is working to find out if that holds true for the COVID vaccines.