I'm trying to book a one night stay in the http://dullesairportnorth.place.hyatt.com HP for the 13th December. When I just select the rate for one night, it comes up to $143 under the Hyatt.com rate but when I select 4 nights, for example 10-14 December this very same 13th of December night is only $79 at the same Hyatt.com rate.

The rate should be called different and not a "hyatt.com" rate for both if the price differs, shouldn't it? I was planning to have this as part of my FFN gathering because I'm planning a trip to the East coast this winter but now I've come across these high single night stay rates. Is there a way to overcome them or how do people get cheaper stays at HP?