Personal fatigue management - heard of the quiet ear technique?

EUROCONTROL has published a document, mainly meant for ATC staff but very much applicable also to airline crew, called Fatigue and Sleep Management.
It is available in SKYbrary through this link:
https://skybrary.aero/bookshelf/fatigue-and-sleep-management-brochure

This 114 page brochure contains easy to digest background science and many hands-on tips for personal fatigue risk management. Among others; the relaxation technique mentioned in the header above, as a means for initiating sleep. Try it out.