Quality of this study aside, and n of 1 here, my own state of mind, clarity of thought, and sleep are all noticeably better when I'm eating 2 or 3 eggs a day, 3 to 5 days a week. (I might go 7 days, but an independent value placed on dietary variety prevents that--perhaps foolishly when I notice what I'm eating on off days instead of the eggs.)
Regardless, this whole eggs-are-evil thing has probably done more to harm the health of Westerners than any other dietary advice, with the possible exception of the fat-is-evil nonsense.
Given that a great number of Westerns are overweight, it's probably appropriate for them to act as though "fat is evil" due to calorie density. Plus: saturated fat should be avoided; this is another thing Westerners are likely to be getting too much of.
Do you think the eggs are causing the better sleep, or are you more likely to have the energy to make eggs in the morning if you’d had a good night’s sleep?