Unlike Ocarina of Time or The Wind Waker , Skyward Sword does not have a traditional dynamic day/night cycle. You must sleep in a bed to change the time, and Loftwings cannot fly at night , limiting your nighttime exploration primarily to Skyloft.
The HD version includes a "Zelda & Loftwing" amiibo feature for faster travel between the sky and surface. zelda skyward sword wbfs