It sounds as though you are very clear on the initial cause of your sleep disruption and it’s good to hear that you noticed improvements in your sleep when you tried CBT-I since that means you were able to successfully tackle the thoughts and behaviors that often perpetuate sleep disruption.
One thing that I think it’s important to stress (and recognize) is that it’s impossible to experience a great night of sleep every single night. Our sleep is very sensitive to our overall sense of wellbeing so it’s completely normal to experience temporary sleep disruption at times of stress, worry, anxiety, or uncertainty.
The less we are able to react to that disruption, and the better able we are to avoid trying to compensate for lost sleep, modifying our lives in response, or putting effort into sleep, the easier it is for our sleep to recover when the initial trigger is no longer relevant.
It could very well be the ongoing investigation and wondering why you are awake at 3:00 AM, and perhaps even the very understandable desire to want to sleep, that could be increasing arousal and making sleep a bit more difficult.
I am so encouraged that you are engaged in so many positive behaviors — things like not napping during the day and only going to bed when you are sleepy (this is different to being tired/fatigued) really help build sleep drive and improve the conditions for sleep to happen. Getting out of bed at the same time each day is also very helpful!
I wonder if there might be anything you can do to make the nights a bit less long and a bit less miserable, since that seems to be a big (and understandable!) trigger for sleep-related worry. If we can make the nights a bit more pleasant, independently of sleep, perhaps that might help lower that anxiety (and create better conditions for sleep, too).
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