Keep those worms cozy with good bedding. Worm bedding can be any 'brown' organic matter really.
The most popular choices for home farmers are shredded cardboard or newspaper.
Many commercial growers use peat (shame on you!) or coconut coir.
Other options are shredded leaves, composted woodchips, sawdust and aged manure.
 
What I've found is that many of these items will mat up densly by themselves but when mixed work great.
Our cat loves to destroy a roll of toilet paper if it's left out, so we mix that in a bit.
I pop a little in the blender with some maple leaves or larger sawdust and/or small woodchips.
We also use alot of shredded newsprint.