The following is the May 27, 2021, Government Accountability office report, Navy Readiness: Additional Efforts Are Needed to Manage Fatigue, Reduce Crewing Shortfalls, and Implement Training.
From the report
What GAO Found
The Navy issued a fatigue management policy in 2017, but has inconsistently implemented it and sailors are not receiving adequate sleep. GAO conducted a survey in 2020 and estimates that 14 percent of officers received the then recommended 7 hours or more of sleep a day during...
https://news.usni.org/2021/05/28/gao-report-on-sailor-fatigue-crewing-shortfalls