Sun Surveyor - Sun Surveyor calculates Sun and Moon Positions, Sunrise & Sunset and Moonrise & Moonset...
Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
The Photographer's Ephemeris - TPE is a tool to help you plan outdoor photography in natural light, especially landscape and urban scenes. It is a map-centric sun, moon and milky way calculator: see how the light will fall on the land, day or night, for any location on earth.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
SunCalc - Find out where the sun will be at any time in any location
Pillow for iOS - An iOS companion that helps you sleep better 💤