First one imagines oneself as the Buddha Vajradhara in sexual union with a consort, and then one visualizes the channels and chakras. Then one generates inner heat and meditates on the melting of the drops, which leads to the entry of the winds in the central channel and their dissolution. There are various signs which indicate that the winds have entered and dissolved, mainly that one has visions of the dissolution of the elements and the visions which indicate the "four emptinesses" followed by the clear light/radiance experience. These visions are as follows:Earth dissolves into water, and there is a vision like seeing a mirage; water dissolves into fire, and there is a smoke-like vision; fire dissolves into air, and there is a vision like flickering fireflies. Then the air element begins to dissolve into the visionary consciousness called "appearance." There is a vision like that of the glow of a butterlamp. Air fully dissolves into "appearance," and there is a vision of whiteness, like a clear autumn sky pervaded by the light of the full moon. This dissolves into the consciousness known as "proximity," and there is a vision of redness, like that of the clear sky pervaded by sunlight. This dissolves into "proximate attainment," and there is a vision of overwhelming darkness, like the sky before dawn, with neither sun nor moon. "Proximate attainment" then dissolves into the clear light; there is a vision of clear radiance, like the sky at daybreak, free from the three conditions. One must recognize these experiences as they occur. This is the process known as "blending with Dharmakaya during the waking state."Regarding the sleep practice of clear light, one first practices generation stage yoga and guru yoga, making prayers to the guru. Then one sets a firm resolution to recognize the clear light of sleep that arises before dreaming. Then one lies on the right side in the lion posture and visualizes oneself as the deity. One visualizes a blue four-petalled lotus at the heart chakra and the central channel running through it, with a blue HUM at the center (one can use just the HUM, or the HUM plus AH NU TA RA placed in the petals as well). The focusing of the mind in the central channel at the heart causes the winds to enter, which leads to the process of dissolution and the visions described above. Then when clear