Welcome to the forum, McDonagh. It sounds as though your insomnia followed a well-trodden path of there being an initial precipitating event (sleep difficulty due to stifling heat) and this sleep disruption changed your relationship with sleep, ultimately leading to sleep-related worry and anxiety, and perhaps the implementation of new behaviors in an attempt to improve sleep that only seemed to perpetuate the problem.
Often, directing attention and efforts towards the implementation of different sleep-related behaviors and working on new ways of thinking about sleep can help improve sleep for the long-term.
Since you do have a history of depression and have experienced a nervous breakdown, I would suggest talking to your doctor or therapist to see if they think that you’d be a good candidate for cognitive behavioral therapy for insomnia (CBT-I).
I hope this helps!
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