Falling asleep is an action per Hindu tradition; only unclutching is a non-action, everything else is action. So for falling asleep, your buddhi need to be powerful! To plan, logic needs to be powerful. For falling asleep, buddhi need to be powerful! Understand, that is why in the west so many people suffer even to fall asleep! It’s only the Vedic tradition which has the solution and answer.
I am telling you, let anybody teach any religion, you can practice all that in the daytime, but if you want to fall asleep the only religion you have to follow is Hinduism, nothing else will teach you to fall asleep! Any amount of any sized bed you can buy, pills you can swallow, only Vedic tradition can give you rest; because falling asleep is an action, it is not collapsing on the bed as you have been taught from the beginning. Your buddhi (intellect) needs to be powerful. Your buddhi will be powerful whole day if you keep your body and intellect powerful. Whole day if you are acting, alive, not entertaining the boredom and tiredness, then just you can stretch your body, it will fall into Samadhi, it will fall into the state of Yoga Nidra.
If you fall asleep after the sexual act due to the pain, tiredness in the body, it is Bhoga Nidra; if you fall asleep after rolling in the bed because of the boredom and tiredness, it is Roga Nidra. If you fall asleep just out of the pure, powerfulness of buddhi (intellect), it is Yoga Nidra.
Understand, entertaining boredom in your Life is hell fire. You can see, many days, out of boredom and rejection when you lie on your bed, you can’t even fall asleep, you will just be rolling, tossing; that is hell fire, understand. That is hell fire.