Natyashastra
अधोमुखस्थितं चैव विवर्तितमिति स्मृतम् । शस्त्रक्षतमृतोत्क्षिप्तमत्तोन्मत्तेषु कारयेत् ॥ २३२॥
Lying face downwards is known as Vivartita posture. It should be used to represent someone wounded by a weapon, dead, vomiting, intoxicated, or mad.
english translation
adhomukhasthitaM caiva vivartitamiti smRtam । zastrakSatamRtotkSiptamattonmatteSu kArayet ॥ 232॥
hk transliteration by Sanscript