Using light to entrain circadian rhythm

NASA project for the longer day on Mars, but opens possibilities here. They were able to force the circadian rhythm to adjust for fitful sleep by applying a waking day protocol of 10 hours (!) of dim 25 lux light, then 100 lux room light, then two 45-min. 10 000 lux pulses before the end of the day.
There are books and sites out there on light-hormone-sleep cycles so that you can reduce and optimize your sleep.