You're off duty, and off payroll by the time you get to the van. Do whatever you want to.

One CA tried to manage my rest period (and the FA's) re. alcohol. HIS policy (applied to all crew members) was 16 hours or therabouts (company policy = 8 hours). I took him aside and explained that my hourly rate was $40...if he wanted to me live the 14 hour overnight on his terms he would need to open his wallet and fork over 28 crisp $20 bills.

He sputtered some crap about PIC authority and told him to call the CP (whom I know) and have the CP call me if needed. End of story