Wait until you're slightly tired. Smoke enough (quality) weed to be really stoned. Wait for it to kick in, you'll feel the huge urge to lay down. Do so, make sure you're comfortable and get rid of disturbances (light, music, whatever bothers you...)
Close your eyes, let your thoughts flow, you'll wake up from a deep sleep with your head feeling somewhat frisky but well rested. Goodnight & goodmorning.