Yes. Because Michigan rest areas are open 24 hours a day, you can arrive at a rest area during night time hours and park overnight for an indefinite period of time. With no specified maximum time limit, overnight parking is effectively permitted. Can You Sleep Overnight at a Michigan Rest Area? Yes. There are no rules or laws against sleeping in your vehicle while at a Michigan rest area. And because there is no maximum time limit, that would also include overnight sleeping. Note: Some rest areas in Michigan have signs posted prohibiting overnight parking and camping. These signs are posted very clearly in front of the restroom facility. If you don’t see such a sign posted, you can assume you can sleep in your vehicle overnight.