sleeping yoga
A Highest Yoga Tantra practice where the practitioner goes to sleep visualizing themselves as the guru-deity in the mandala in order to make it easier to attain the clear light mind. In the generation stage, without the realization of emptiness, this is called "with fabrication" or "with sign"; in the completion stage, with a realization of emptiness, this is called "without fabrication" or "without sign." See also waking yoga.