Recently I have been thinking about taking up some alternate nostril breathing from Hatha Yoga. It's great for balancing your nervous system, increasing energy, and improving focus. It is good for enhancing psychic experiences such as meditation, astral projection, and lucid dreaming.
The lucid dreams stopped, but the stomach discomfort continued. I have stopped taking this supplement. I have a feeling it would be best to only use it for a while from time to time. Not staying on it indefinitely.
Could you please try feeling heavier and sinking into the bed or becoming lighter and floating upward? Not as something taking effort, but gradually imagining what it could be like. So that you don't start adding tension to your body. When you imagine an activity, your brain starts to prepare the nerves and muscles in advance. They can measure electrical signals. You may be losing ground with your relaxation and trance.