Well, I mean, it kind of is. Intermittent Fasting is 50% just your sleep hours which makes it super easy. 16:8 rule would be 10x harder for most people if it didn't include sleep hours where you are literally just not hungry. You eat at like 8PM and go to bed at midnight. That is 4 easy hours because you already ate at 8 so you most likely won't feel hungry before you go to bed. Then you sleep for 8h, and while you sleep you don't have hunger. That's 12h total. Then you just need to wait post sleep for 4h only. That's really the only thing that matters. Those 4 hours of morning for good time management. In total it is 16 but sleep + hours of fullness after eating your dinner is what makes IF so easy & effective. You just need to provide the morning effort, otherwise it would have been so much harder for most people.