You dont "need" time to wind down because you finish work at 1pm though. What I am saying is that you leave work (whether that be an office, shop, hospital, whatever) long before you have to go to sleep. Okay, so if you are doing housework right up to bedtime, yes, you could argue that you are not getting time to wind down, and that's fair enough. I suppose what i'm saying is that whether your DP "winds down" or goes to bed, it sounds like he wont sleep anyway, if he's just left the office/shop/hosptial/call centre. I used to be the same after doing overtime at work in the office - if I didn't leave till 1am, I'd be tired as could be, but I'd still have to sit watching TV or doing something mindless for a good couple of hours or I couldn't sleep, I'd be buzzing. Same with when I was at college which finished at 10pm - I'd always have to wait up till about midnight before going to bed, even though I had a young baby at the time and knew I'd probably be woken at 6pm.
So I'm not saying you shouldn't get this luxury too even though your "work" at that time of day is in the home - of course you should have a few hours after the kids are in bed to wind down and feel like you have a life. But I do also think your DP should have this time - he may not even have a choice in that if he did start going straight to bed, he'd probably lie awake having that time anyway and would be in no more of a position to get up early.
I suppose what I'm saying is you should both have it, not simply he shouldn't because you dont.
Can you clarify if he goes back to bed or if he is living on 4 hours sleep a night every night?
It seems to me that he should do a bit more in the day before he goes to work - perhaps between the hours of 1:30 and 3:30 when he starts work, so he can spend that child free time sleeping or dossing about if he must but once the kids are back, he should get at least an hour in of tasks, to take the burden off you, then on his "weekend" (those 2 days he doesn't work) put a lot more effort in to make up for only contributing an hour a day when he is working?
Or similar?
He shouldn't be "winding down" at the expense of you ever having any free time yourself, but I also think realisitcally if he's not finishing work till that late, going straight to bed instead of winding down will achieve little in terms of him not being "too tired" anyway...?