Sorry , Barbiesboy , but FTLs are NOT the answer to fatigue - you must be one of the lucky ones with a 9-5 flying job .
Circadian rhythms are a big factor.
It is widely agreeed that Rest periods should be less than 18 hours or more than 30 hours , and that is right . However , when I worked for a BIG airline on longhaul doing Transatlantic flights , ALL our rest periods were circa 22 hours , the company knew it was not the best practice but had no choice really . The rest period more than compensated for the previous duty period of between 8 and 11 hours , but that did not make it good. Just as you were ready for your 2nd sleep , it was time for the return to work for a difficult night .back across the pond . I know how I felt after one of those , let alone 5 or 6 in a month . I was VERY pleased to get back on shorthaul I can tell you .