Have you have ANY training?
You ask a question that has been beat to death since the Hours of Service changed in January 2003 and then again in October 2005. The split sleeper berth went out the window then. And this is still one of the more controversial issues in the law.
Basically you must have 8 consecutive hours in the bunk plus another 2 hours in the bunk or off duty.
I suggest that you and your friend view
Ol'Blue, USA - CDL & CMV Safety Info Center and do some serious reading. A good place to start is the section
Ol'Blue, USA - Brochure. All the information that you need will be found on the website. There is also more safety information that should be reviewed.
Also you need to know that these rules MAY change again as the whole ball of wax is being reviewed by the House that King George lives in and will probably be finalized sometime in the near future.
Know the law and be safe. Good luck.