Does everyone in your group work the same strange hours as you, or are you the only one who usually stays super late? What time do you show up in the morning? You're a nut :)
I'm definitely an outlier, though the Broad does seem to kick off later than many places. I have an 830a meeting on Thursdays that everyone agrees is torturous. I often don't show up until 10a. There is some rationale for this - it's a busy, collaborative environment, and I find I'm most productive when there are fewer distractions.
One day, I will figure out how to be adept at life. There are definitely many areas where I can improve. I've often wondered if there is a life boot camp I could attend to learn the skillz, but so far Kenny's educational webinars don't cover this subject.
Adept at life: I laugh at your optimism. To quote Rush, "Changes are permanent, but change is."
I I like that the Broad doesn't force you to conform to "traditional" business hours. Except Thursdays. Don't change, you've got most of the necessary adulting skillz down.
Also, adulting is overrated.
Enjoy the loose hours. It's worth all the other aggravations you may have to put up with.