The issue of fatigue in the maritime industry reminds me of what Mark Twain said about the weather; "everyone talks about it but no one does anything about it"
It is a bigger problem on some ships and trades then others. For example small coastwise ships and car carriers. Take a look at some of the reports on the last link
Below is the best I've come up with so far on-line
Overcoming Fatigue - Willpower or rest?
Fatigue On Board "The International Federation of Shipmasters' Associations
(IFSMA) asked The Nautical Institute to outline and
articulate Institute members' views on fatigue to the 37th
meeting of the IMO STW sub-committee in January.
This article is based on David Patraiko's presentation" - 6 page pdf file
List of Fatigue Reports Reports submitted autonomously by mariners - Interesting reading but just the tip of the iceberg
Down with 6 and 6 (pdf)