Summary
The proper way to interact with light in the first part of the day is to get as much light as possible into your eyes. Even on cloudy days, being outside will provide enough intensity of light to adjust your circadian rhythm. If going outside daily, 15 minutes is recommended, and if not done daily, you may want to increase the duration. Light through a window may decrease the amount of light energy, so going outside is preferred. Between waking up and when the sun rises, try to let your body get morning sunlight as it seems to be important for humans. Artificial light can also be used during this time.