As an aside from the original question, I'd like to add that I currently do a job which sees me setting my alarm for 435am. I'll be honest and say it worried me what the impact would be on competitive sport and training. But...I will say this was unfounded *as long as* I go to bed around 930pm-945pm AND I nap for 30mins or so in the day when I feel like it, whereupon I am well finished my part time job. It's been fine. Now, proper night shifts are allegedly a different kettle of fish altogether.
I would agree that proper sleep is imperative but the odd bad night of sleep (this was normal with bike racing the night before and invariably meaning an early start) should not be used as an excuse for poor performance. Now, cumulatively bad sleep is bad.
45M, 5'11", 71kg, ex bike time trialler, SBs - 18:09(5K), 8099m(30mins), 37:18(10K), 15810m(1hr), 1:21:41(HM)
Targets: sub 18(5K), sub 37(10K)
PBs: 6:44(2K), 18:02(5K), 8120m(30mins), 37:18(10K), 15810m(1hr), 1:21:41(HM)