Is it possible to adjust the sleep time? Seems like it's set to a static expectation of 9 hours for sleep? I assume that's based off a standard 8 hours for sleep and 30 minutes padding on either side for waking up and going to bed. Some people may want to attempt to sleep less/more I dunno. Need more manual control like adjusting expected sleep time to 6-12 hours? Perhaps in an advanced interface.