The 6ft hutch i got for free when i rehomed Tilly does not have a sleeping compartment, so she has an animal carrier, which i have stuffed full of hay and straw, but leaving enough space for her to nestle into it.(would it be better if i filled it completly, so she can get right in it?) I also cover her with a sleeping bag and she has a full hutch cover on top, what else can i do to make ure she's warm enough???? I do worry about her out there.