Hey there Gardengirl13,
From the perspective of someone suffering with AS, etc. as well, your question is not only relevant but vital. As many others have already stated, it does seem reassuring that you and your husband are comfortable enough to tell each other the honest truth, even when those truths may be hard to hear. That is a bonus as far as I'm concerned. I'll take honesty over diplomacy any day.
From the perspective of a husband however, I feel I must represent my fellow brethren out there and say that your timing is something that could be described as "stupid" - although I would use different words like unfortunate, not well thought out, etc.
My wife waits until bedtime to drop bombs like that on me too and I cannot fathom how this makes sense in her mind. We could sit for hours not saying anything to one another and then just as the lights go out and we exchange our "sweetdreams baby"'s...BAM! Some major issue gets brought up?
On behalf of husbands everywhere, if it wasn't important enough to bring up several hours earlier than it isn't so important that it cannot wait until tomorrow - don't wait until bedtime to discuss these sorts of issues.
How was that for the Good Cop/Bad Cop approach?