It sounds like an awful lot, and like you have some dependence. But everyone else has covered that.
I'm not sure I saw your age, but you can't keep that kind of life up. I have also worked in highly intellectual, pressured, devote your entire life to this, kind of organisations and it was ok before I had children and both my dh and I just worked really really hard, forgetting to eat, glued to our blackberrys etc. A LOT of people in my org got burn out after about 3 years of it. (Drinking not an issue for us, but the poor lifestyle generally was bad for both physical and mental health.) People's relationships with partners AND children suffered badly.
Here are some things that have made a difference overall (may not be possible):
I have reduced my hours, initially to about 50 hours per week, then to actual part-time, (since having children).
Work from home where possible, which frees up commute for other things such as taking children to school/gym/cooking.
Fit a mixture of yoga type exercise and running/aerobic type into week, and put that time in your diary so no one can put meetings in. Refuse to give up these times except in dire emergency.
Put a half hour for lunch in diary at least once a week and try to get outside.
Set some small breaks. I've found there's some great desk yoga sequences on Yogatic.com/ Esther Ekhart on YouTube that last 5-10 minutes.
The people who do Natal Hypnotherapy CDs also do a non-pregnancy anti-stress one you could use to wind-down instead.
Look at some kind of evening mobile/laptop use protocol whether that's just at home (no phones at the table), or company-wide (no calls after xpm except in certain defined circumstances).
Also consider that if you are sending emails/calls very late your juniors will feel they have to respond and if THEY get burn-out there may be fall-out on you.