I have a Surge but am looking at getting a Blaze so that I can take advantage of the sleep stages. I use to use an app that would do it and you could set a ranged alarm to wake you up when you are in light sleep instead of deep or R.E.M. I woke way more refreshed, but had to sleep with the phone on the bed. Does sleep stages offer this type of alarm feature?
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I haven't seen that mentioned in the documentation, so I will say no. The Fitbit alarm is a standard one, and doesn't adjust on the fly like that. I've used that kind of feature on a smartphone app before. It's really nice, but pretty complex in terms of the programming I believe. The tracker has very limited memory resources compared to a phone, so it won't have the same robustness in its function.
I like the idea a lot, and hope you head over to the Feature Suggestion board and add that as a request. If enough people vote for it, they may implement it next time around.