A driver with a sleeper berth has more ways to take the 10 hours off duty that § 395.3(a)(1) requires, and § 395.1(g)(1)(i) lists five. At least 10 consecutive hours off duty. At least 10 consecutive hours of sleeper berth time. A combination of consecutive sleeper berth and off-duty time amounting to at least 10 hours. A combination of at least 7 consecutive hours in the sleeper berth plus up to 3 hours riding in the passenger seat while the vehicle is moving on the highway, immediately before or after the sleeper berth time, amounting to at least 10 consecutive hours. Or the equivalent of 10 consecutive hours calculated under the split provisions — which is where the real flexibility lives.

The split is set out at § 395.1(g)(1)(ii). A driver may accumulate the equivalent of at least 10 consecutive hours off duty by taking not more than TWO periods of sleeper berth time, or a combination of off-duty and sleeper berth time, provided four conditions all hold: neither rest period is shorter than 2 consecutive hours; one rest period is at least 7 consecutive hours in the sleeper berth; the total of the two periods is at least 10 hours; and the driving time in the periods immediately before and after each rest period, when added together, neither exceeds 11 hours under § 395.3(a)(3) nor violates the 14-hour duty-period limit under § 395.3(a)(2). Two periods, not three; a 7-hour anchor in the berth; nothing under 2 hours counted; ten hours in total.

The benefit is in the calculation rule at § 395.1(g)(1)(iii), and it is the whole reason to split. The driving-time limit and the 14-hour duty-period limit must be RE-CALCULATED from the end of the first of the two periods used — and the 14-hour driving window does not include qualifying rest periods. In plain terms: a qualifying rest period does not merely pause the window, it is excluded from it, and the clocks are then measured again from the end of the first rest rather than from when you originally came on duty. That is what lets a driver who splits correctly recover window that a single long break would have consumed.