All redeyes are fatiguing to me. It doesn't matter if it's 9 hours with a nap or 4 hours without one. Trying to sleep during the day has never worked for me. I'll work until 2am or get up at 4am but if I'm not sleeping soundly during those two hours I'm useless. I'd bid any fleet and any seat that doesn't have them. Unfortunately that no longer exists. Avoiding them was much easier 4 years ago, now I am a slave to the drop/swap to rid myself of them. I can't say with certainty if its the cause but but my experience seems to correspond with the optimizer Gumming things up. My only fatigue calls were directly related to redeyes, either no rest on a "dayover" or unable to swap sleep cycles mid rotation.

What that has to do with a 4% noncon raise, I have no idea but I feel better sharing because this seems to be getting worse (or I'm getting old...er)