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Good morning, I am Dr Ruff, thank you for contacting us today
I am sorry to hear this, it may be that he is suffering from PTSD.
This is quite common post prison, but is indeed important to address. However your brother would need to want to seek help for any help to be given.
Options include medication to help with his sleep as better sleep will often improve mental health. This can be in short term sleeping tablets, or even anti depressants. Anti depressants may also help with the sleep and PTSD symptoms.
As per PTSD a type of counselling, eye desensitisation, can help a lot with this. You can contact any counselling service for this.
But as mentioned, I would express your concern to your brother, support them in seeking this help, but you may also need to give them time before they are ready to do this.
I would suggest a Psychologist to being with as they can also diagnose this and would be easier to see one over a psychiatrist.
That is a very personal thing to your brother and you, so I do not know, just express your concerns.
No worries, I am sorry it can't be easier. All the best.