via Watch Aware:
David Smith has released a new native Apple Watch app called Sleep++, an app that uses the Apple Watch to track your sleep. While the app idea is interesting, Smith decided he wanted to figure out a way to charge his Watch quickly during the day so that he could sleep with it on at night.
I plan on instituting this plan going forward. I purchased Sleep++ and will do the morning and evening charge. I also have a charger @ work that I can use half an hour a day to keep things topped off.