Are u able to sleep overnight

Yes

Its a rest area so, I assume so! Lock your doors. Lots kf transients around there lately.

You can stay up to 12 hours in any 24-hour period. https://www.tripcheck.com/Pages/Rest-Areas-Regulations

Well thats only common sence. Lock your car where ever you go.

Your not supposed to, but many people do. Lock the car.