Yoga Nidra is a sublime science of complete relaxation rooted in a vast body of knowledge from ancient traditions. Because Yoga Nidra is a convergence between sleep and meditation, it may be practiced lying down or seated; any way you can be comfortable. Specifically, Yoga Nidra represents a state in which an individual demonstrates all the symptoms of deep, Non-REM sleep, including delta brain waves, while simultaneously remaining fully conscious. Simply put, brain waves are electrical charges in the brain that are fluid depending on what we are thinking and feeling. Delta brain waves allow for healing, rejuvenation, revitalization of the brain and the strengthening of the immune system.