This link (about Sleepy Orange caterpillars) may be helpful. It doesn't give much information, but a Google search provided a few more sites that may be helpful.
GOOD LUCK!
K

Here is a link that might be useful: Sleep Orange Butterfly facts

I think Miss Sherry has raised them. I think she also grows a lot of Senna and lets them fend for themselves. She should be able to help you next time she checks in, or do a search on the forum and you will probably find some of her previous posts.
Liz