I use the clock feature on my iPhone (pretty sure there's equivalents for android), where if your phone is horizontal and charging, the lock screen shows one of several large clock face options. I 3d printed a phone stand for it. It's sensitive to both light levels and motion - so it's completely black when there is no motion detected. If you happen to wake up at night and open your eyes, everything remains dark. If you turn to look at your phone/nightstand, it usually turns on the display. Sometimes I need to wave my hand a bit. The balance is pretty good. I choose the giant Comic Sans type numerals as I wear glasses and that makes it still legible for me. [edit - it's called 'standby mode']