Welcome to the forum, Batgirl, and thanks for sharing your story and your completely understandable concerns!
First of all, please be reassured that there’s no evidence that chronic insomnia causes brain damage — and that might be because the body will always generate, at the very least, the minimum amount of sleep we need.
After five or six hours of sleep you will have almost certainly got all of your deep and most restorative sleep (N3 sleep) so an extra hour probably wouldn’t have a huge effect on how you feel during the day (that’s influenced more by what we do during the day and what happens to us during the day).
In any case, it sounds as though you are really making progress and you are sleeping better since you stopped taking the antidepressant!
May I ask what time you usually go to bed at night and what time you get out of bed to start your day in the morning?
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