I have a pretty consistent sleep schedule (that's set up on my Forerunner for all days of the week), but every now and then I have odd days when I have to wake up earlier. Currently in order to accommodate for these days and still get my evening / morning reports at reasonable times I go to the sleep schedule and change it for a specific day. The problem with this approach is the fact that the next day I need to go back to the sleep schedule and undo the change.
It would be nice if there was a way to override sleep schedule for the upcoming night only, so that your sleep schedule is unaffected but you could still benefit from morning/evening report (and other features) being triggered at the appropriate times.