QAR
18 hr rest periods, earlys to lates to nights is a by product of one thing called CAP371, particularly said rule on max 3 earlies/nights.
We all hope that Sub Part Q will eventually reach these shores and you will see much more sensible schedules. For example why not offer 4 consecutive earlies or nights instead to solve your complaint. Which is better?. Given that is medical evidence to support 5 earlies (EZY) and 4 nights (DHL) there should be no issue