In a breakfast eater, cortisol peaks at 6am and leptin peaks 12am - 6 hrs earlier.
In a breakfast eater, cortisol hits its' lowest at 12am and leptin hits it's lowest 9hrs later at 9am.
In an IF'er, cortisol is still hitting it's peak at 6am and leptin is hitting it's peak at 5am - 1 hr BEFORE cortisol hits it's peak.
In an IF'er, cortisol still hits it's lowest at 12am, and leptin hits it's lowest at 4pm, 7 hours BEFORE cortisol hits it's lowest.
I haven't been able to find anything that indicates that leptin hitting it's peak and lowest points before cortisol is a bad thing, and I don't know enough about cortisol and leptin to draw my own conclusions about why this would be bad.