I applied to PhD programs for Fall 2018, and am currently evaluating my options. I have narrowed myself down to two options, both good choices with potential advisors who are a good fit, though I prefer one school slightly over the other.
The reason for my post is that I am interested in deferring my admission for a year. My understanding is that graduate schools typically let students do so when the student has a "good reason", i.e. those who want to spend time studying abroad, doing volunteer work, etc. The catch here is that I don't have any particular opportunities I want to pursue, I just want to take a break and work on some mental health issues I have before signing on for a 5-6 year commitment (really even longer considering the time afterwards spent in post-docs, trying to find tenure-track jobs, etc. if I want to try to stay in academia).
I haven't heard of any situations like this, and I'm not sure how the graduate schools will react if I ask. Is it possible that they'd revoke my offer? I've also already spoken to potential advisors, should I let them know? I'd be worried what they might think if they knew I wanted to defer graduate school for this reason.