David Smith has released a new app called Sleep++, which uses the Apple Watch to track your sleep. To wear a Watch at night, though, Smith had to figure out a way to charge it quickly during the day.

He ran some tests, and the results are interesting:

I have been tracking my sleep every night for a couple of months now so I’ve learned a few strategies to make this work pretty well.

The TL/DR is to charge your Apple Watch in the morning while you get ready for your day (take a shower, get dressed, etc) and then again in the evening while you get ready for bed (brush teeth, put on pajamas, etc). Then put your Apple Watch in Airplane Mode while you sleep.

I can’t wait to try Sleep++ with this method (which also happens to be used by other cool people).