Always temped to go out and watch TV with her. Tonight I just stayed put, reading. Again, not sure which is the 180.
I'm glad you didn't. I think you should spend time at home, work on projects, read, spend time on your music.Most importantly do stuff with your kids. I wouldn't be her best buddy. Polite but detached. I think if you do too much stuff like watching TV with her and chatting, it sends the message that you're ok with what she's doing and will continue to provide her emotional support. Which if she divorces you ultimately, I hope you would not do.
Re: the sleeping I went through that also. I noticed on days I exercised I usually slept better. If that's true for you, maybe you could try to take a walk with the boys after work or bike or something like that?