Very "The Waltons"... expect them to chirrup ".... goodnight John Boy". They do/did go upstairs, usually using the ramp for exercise - not to sleep or lay tho', and have realised the two that spent most of their time up there, were Questran and Queenie in the past few weeks to get away from the dampness.
Use wood shavings, replaced as much as could during "torrential rain" time ... but the shavings were damp quite a bit of the time ?