Kelno'reem is the Jaffa meditation ritual akin to sleep. While the Jaffa meditates, the Goa'uld symbiote repairs any health ailment that the Jaffa suffers from. It can also be used to slow down the Jaffa's heart, and so much that it can beat once per minute, or even stop the heart altogether. In this state the Jaffa is able to communicate with his symbiote, although this kind of communication is forbidden by the Goa'uld as they don't want the Jaffa to influence the minds of their young. Teal'c often lights candles to perform the meditation. Whether other Jaffa do the same is unknown. (SG1: "Holiday", "Descent", "Fallen", "Crossroads")