Practice in stages: 1. Keep dreaming (I am the master here) 2. Keep the dream stable (stare at or touch something until it becomes clear and real) 3. Try to change the current plot (if it is difficult, don't force it for the time being, switch to the next exercise to avoid disillusionment). Pay attention to this principle: don't dream on your own initiative, but try to modify the existing script given by your subconscious so that you won't collapse.
Exercise at ordinary times: occasional scene simulation during the day: 1. Doubt about the things around you (what is this? Is it possible? ) 2. Observe the details of things around you. The habit of thinking calmly.