Do fairies hibernate?

You're darn tooting right they do.  Don't be ridiculous!  But they have some very strict requirements before they drop off.  

1.  They must have red slippers.

2.  They insist upon yellow and blue pjyamas.

3.  Most crucially they absolutely must have a burrow of fine tilled earth.

If they don't get these things they creep into houses and cause shenanigans.  These shenanigans tend to come to fruition at 9.48am on Christmas Day.  So, if you find that at 9.48am on Christmas Day that things in the house just aren't quite right then I suggest you head outside with a spoon and get digging...