Most butterflies spend winter as caterpillars, but the brimstone, comma, peacock , small tortoiseshell and red admiral hibernate as adults. The small tortoiseshell and peacock often hibernate in our houses! They will find a quiet place and settle down, only when we turn the heating on they tend to wake up thinking its spring and there will be lots of flowers with juicy nectar for them.
How to help! The best way to help it, is to find a cool dry spot. Gently put it into a cardboard box and let it calm down for a while, then leave it in a suitable place like your shed or garage.
You can read loads more about butterflies at Butterfly Conservation web site.
This is part of the Autumn Minibeasts information.