My Dear Alias Hogsnort ( interesting nick by BTW) . I think I have a fairly good grasp of what accumulation of fatigue is .And I have both :
a) theoretical
b) practical
which is 3 years on coasters around european waters with me & master for keeping watch 6on/6off at sea and port ??? …port was mine from arrival till departure . 9 months contracts.
It was before ISM, MLC era and master could dismiss You w/o notice because for example You did not like sth or dared to complain abt sth .
Rest hours ??? WTF was that ???
You have not come here to rest getting all this fantastic money so you can live like a king in your poor country . This is work factory 
German environment under Austrian flag. The difference between the labour camp and ship was that I got all this fantastic German Marks so I could live like a king. 
. How about that for an experience. ???
Another few years later and my first command here:
1060 teu
6 months contracts on Limasol >Damieta> Beirut>Lataquia > Mersin > Limasol Merry go round and every two sometimes 4 weeks we got vacation going from Mersin to Izmir > Ambarli Limani> Gemlik > Limasol. On this long leg we were resting especially in the Marmara sea traffic chaos and Canakkale narrows. Pilot??? you dare not upset the charterers with such stupid concepts captain -that was the helping and caring hand of the managers to ease the condition of exhausted zombies.
I was even more resting filling up the second log book showed only in Turkey as somehow due to some agreement Turks were not supposed to know we called Limasol Cyprus. Her name then was FAS Lattaquie chartered by CMA Fr then , and was part of the Sadee family mafia dealings .
But due to this totaly incomprehesible dealings once a month we were arrested in Lattakia doing nothing for abt 7 days - meaning I got time to catch up with ISM/SMS paper work , go out to see the beautiful city it once was and buy some lovely gold . No MLC and STWC rest hrs yet in sight .
How abt same ship but this time under different charter: her name was P& O Nedlloyd Curaçao. 6 month contract with 21 ports in the Carribean sea w/o arrests in between what was distressing . You could rest at home going around your house for one month after sign off due to Merry go round and mental habit acquired o/b.
The management showed great magnanimity and caring for your well being by not sending you in that nightmare again.
Will give You heads up later on other sleep disturbing aspects there , not mentioned by @244
We had Anshutz autopilot , 1 GPS , 2 x ARPA Anshutz , DEAD MAN push button and I was exctatic not having any of this " disinformation technologies " helping to disturb and distract us from keeping a " continous radar watch" with its overflow of useless information and infuriating alarms . Despite having everlatsting and uninterrupted REST from "resting " we managed somehow with side effects materialising at home as described above.