In the first period of the night, twelve ways of suppressing the vital air are recommended. After sleep, in the last period of the night, other twelve ways of doing the same have been laid down.
निशायाः प्रथमे यामे चोदना द्वादश स्मृताः। मध्ये स्वप्नात् परे यामे द्वादशैव तु चोदनाः॥