After decades of using an alarm clock and sleeping in a dark room, a few years ago I began going to bed consistently around 10pm and allowing natural light to w

After decades of using an alarm clock and sleeping in a dark room, a few years ago I began going to bed consistently around 10pm and allowing natural light to wake me up. It has really improved the quality of my sleep and my feeling of restedness in the morning. Of course, this means the time I wake up does vary throughout the year, but the time change helps keep it more consistent and even in the middle of winter, waking up at 7:30 or so give me plenty of time to get to work. I do know people that use lighted alarm clocks and report similar results, but that's clearly just an imitation of the real thing.