Help! My worms are crawling out of the bin. What do I do?

It could be a few things:  too warm, too wet, too noisy(vibrations). They could also be hungry, but you’ve done this before so that’s unlikely.

I suggest you verify that the bin is not too warm or wet and is free from vibrations, then leave the lid off and a put bright (at least 100W bulb) light above the bin for a day. That should encourage them back into the vermicompost soil layer.