good luck with this Joe.
If it doesn't work out for you, you could always try sleeping less in a monophasic style. I personally sleep 6 hours a night, 12 - 6 am. You'll be tired when you go to bed and refreshed when you wake up, you said on the first day, sleeping from 2 - 6.30 that you woke up fine.
It seems that the attempt to sleep at 4pm is what is messing things up. You're trying to to get 7.5 hrs to 8 hrs a day, is this because this is the majority opinion on how much sleep the body needs? I rejected this a long time ago. It may be true for some people but it's not a rule for everyone. Why not try 6 hrs a night? You'll find the right sleeping pattern for you buddy, keep trying
