In Jain context, “Shyan Vidhi” usually means the proper discipline of lying down / sleeping with awareness, restraint, and non-violence.

If this is asked in relation to 72 Kala (Bahrash Kalā / arts of cultured living), then it generally points to the art of sleeping in a dignified, controlled, and spiritually disciplined way. The idea is:

• sleep only as much as needed
• avoid laziness and attachment
• lie down with calmness and purity
• maintain awareness so that one does not fall into carelessness
• keep the body in a respectful and comfortable posture

In Jain Dharma, even daily actions like sleeping, sitting, eating, and walking are meant to be done with sanyam and jagruti.

If you mean “shayan vidhi” as a specific item in a Jain list of 72 kalas, it is the discipline of proper resting and sleeping behavior rather than a separate ritual.