<human>: I have the privilege of working in a very small company (for over 2 years) with a boss who is always in the trenches with us as well as a good mentor. He knows that I've been going through some personal concerns in relation my bipolar disorder and dealing with the side effects of new medication. 

I don't get along with 2/6 of my coworkers because of difference in work style, preferences on handling situations with clients and just overall personality. We currently work 8-5pm. I am a key holder and usually am here by 7:30 on the dot to beat traffic.

When expressing my concerns to him about how I've been feeling (I actually wanted to submit 2 weeks notice) He said that he understood everything I was going through as he has people within his world who suffer from the same types of things. Things along the lines of "Go take a two hour walk if you need to." "Go into the conference room lock the door and cry if you need to." were offered and that he genuinely wanted to help me and put me in a place where I could succeed here. He also said that he has never second guessed me getting my work done and knows I am fully committed to the company.

The relationship with my coworkers is stressful and I consistently get distracted by the music they play (refuses to use headphones) their constant off track chit chatting and the negative tension is super high considering they won't talk to me unless they absolutely have to.

I do my best work when they go to lunch or before they come in during AM hours.  I want to know how I should best approach him about requesting an hour shift from 7am - 4pm. This would not impact my duties or client needs nor displace me from company meetings. I don't want to blame it on my mental illness as I feel strongly about being able to manage this and cope, but I feel I would work better on that schedule.

What is the best way to ask him about this that doesn't highlight my health or place blame/point fingers at coworkers?

Can you give me a shortened version of the text?
<bot>: I want to shift my work hours from 8-5 to 7-4 to focus better and be distraction free. Need to know how to have this conversation without blaming coworkers or falling back on my mental illness.