When I was working a really stressful civvy job that had me feeling like this (logging in to check emails on my day off, etc) I was seeing a counsellor and she recommended "when you're finished for the day, do something with your body that completely takes you out of the headspace." For example, go swimming, go to the gym, go for a fast walk. Spend time grooming my cat. Give myself a manicure. BUT the really important thing is that while doing these things, I should leave my work phone out of sight and either switched off or on silent. And if I'm doing a manicure, it shouldn't be in front of the computer where I'd be tempted to check emails.
It sounds like you finish quite late at night but could you maybe take a nice relaxing bath before bed, with a book or magazine (or Netflix on your iPad if you're me LOL)? Maybe 5 mins of meditation before bed would help as well - I downloaded an app called Stop, Breathe, Think recently and it guides you through loads of different meditations depending on if you're tired, stressed, anxious, or want to gain energy, etc.