Does that charging strategy have any impact on the battery's life? I know batteries are rated for a certain number of recharge cycles but I don't know enough about the technology to know if multiple partial recharges have a neutral or negative impact.
That said, @_davidsmith 's new sleep tracking app for wOS2 is quite nice, and I found that his charging strategy does the trick - https://david-smith.org/blog/2015/09/21/how-to-wear-your-app...
I only needed 15-20 min in the morning and evening to get to all day usability.