The question, for non-union without a contract, what are the rules regarding 24 hour shifts. Specifically, does the employer have to provide a station, sleeping accomodations, or is there any guidelines limiting the hours one can work without these accomodations in Michigan?

Try this.
http://www.dol.gov/esa/regs/compliance/whd/whdfs22.htm

Also, you can inquire specifically of the state Dept. of Labor.

This seems to be the right source for most of my questions.
Thanks