I had similar issue and simple request daily night "Divine VK please activate deep sleep now" three times and it takes anywhere b/w 10-30 mins. Each day it’s different because we spend our energies differently so our body-mind-soul requires different duration. Before requesting VK, i take three deep breaths and free the body completely then request VK after that i chant GOLDEN SUNRISE or other mantras which takes me to deep sleep.
