MadePossible

I just read your description. It seems you're talking about something else entirely. My mistake.

Is this the Chen Tuan sleep meditation (睡功)? I've been practicing it but I don't feel anything special. Could anyone provide any tips and tricks? I think maybe if you're not yet a high-level practitioner, then it's probably pointless. I say that, because the start of the practice mentions swallowing 'saliva', which is an advanced stage of neidan, and this meditation is considered neidan. Perhaps Yoga nidra would be better.

Are all instances of 常 actually 恒 or only some?