Astanga Hrudaya
स्वप्नेन रत्रौ कालस्य सौ म्यत्वेन च तर्पिता। शीतसात्म्या दृगाग्नेयी स्थिरतां लभते पुनः॥१९॥
Importance of Night and Sleep for Healthy Eyes. The eye is Agneyi – predominant with the fire element, being habituated to cold comforts it regains its strength after good sleep and nourished by the coolant nature of the night.
english translation
svapnena ratrau kAlasya sau myatvena ca tarpitA। zItasAtmyA dRgAgneyI sthiratAM labhate punaH॥19॥
hk transliteration by Sanscript