Using an AP is a free action (only on your turn), so as long as you're able to use those, you can use an AP.  (Dazed is perfectly fine, but stunned or unconscious, you can't.)<br/><br/>I don't understand the reroll bit, though.  Making a saving throw isn't an action, it's just a game effect that happens at the end of your turn; you don't get to make a second saving throw if you AP for it...