He felt at peace only in the hour before dawn, when the darkness seemed to give way slowly to a mist, and it was at this hour that he would wake and sit by his window.
Peter Ackroyd, from Hawksmoor
From Online Etymology Dictionary ...
window (n.)c. 1200, literally "wind-eye," from Old Norse vindauga, from vindr "wind" (see wind (n.1)) + auga "eye" (from PIE root *okw- "to see"). Replaced Old English eagþyrl, literally "eye-hole," and eagduru, literally "eye-door." Compare Old Frisian andern "window," literally "breath-door."Originally an unglazed hole in a roof. Most Germanic languages later adopted a version of Latin fenestra to describe the glass version (such as German Fenster, Swedish fönster), and English used fenester as a parallel word till mid-16c.