Instead of having fixed cost redemptions, the cost of the free night is dependent on the actual cost of the room on that specific night. (travelcodex.com)
If you reserve one hotel room for you and the family for your entire stay during your conference or business meeting, you can deduct the entire cost of the room. (realtormag.realtor.org)
You shouldn't be saving points just for the sake of saving points, but if you're lacking in points, I think it's also fair to compare the Points + Cash cost directly to the actual cash cost of the room. (travelcodex.com)