English to Spanish Other Tourism & Travel

Thank you in advance for your answer. I understand the meaning of trapped nights but I don't know how to convey it in Spanish. The term relates to the nights which are betwween minimum stay bookings in hotels. Sometimes single nights (trapped nights) can be booked if they are trapped in, for example, 2 reservations of a 3 days minimum stay. The context is as follows:

Because of our remote location, we have a minimum booking of two nights, and for certain dates there is a minimum booking of three nights. We don’t accept single night bookings except on the rare occasions that we have a trapped night between other bookings.