Those 8 hours in the sleeper berth do not count as part of the 14 hours. This means that you only used 7 of your 14 hours so far, and your 14-hour limit gets extended to 5:00 a.m. the next morning (original 9:00 p.m. limit plus 8 hours).
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Off-duty time is when the driver is relieved from work and all responsibility for performing work. According to FMCSA hours of service, a driver who is in the sleeper berth and logs off duty can found in noncompliance for either an inaccurate log or a form and manner violation.
This means that you are not allowed to drive a commercial motor vehicle after you've been on duty 70 hours in any 8 consecutive days. Once you reach the 70-hour limit, you will not be able to drive again until you have dropped below 70 hours for an 8-consecutive-day period.
The so-called “split sleeper berth” rule. For those not familiar, the split sleeper berth rule allows commercial drivers to split their mandatory 10-hour rest breaks into two non-consecutive segments and still reset their substantive time limits. The shorter of the two segments must be at least two hours long.
A driver may use a 7/3-split (sleeper berth for 7 hours, 3 hours off-duty) or an 8/2 split (sleeper berth for 8 hours, off-duty for 2 hours). Commodity drivers are still prohibited from driving more than 11 hours inside the 14 hour window.