DD has never slept a longer stretch than 3 hours in her 9 months of life, and in the past few months she wakes every sleep cycle (1-1.5 hours). As a result, I've not had an unbroken stretch of sleep since before she was born.
My fear is now, what it's done to me. I used to joke about how I could sleep anywhere, anytime (and could sleep forever) pre-baby. Now I can't nap in the day if DP offers to mind her for a few hours, I struggle to get to sleep some nights despite having been up 16 hours on chronically broken sleep, and I've started waking up literally a couple of minutes before DD stirs at night and then being unable to get back to sleep after she's settled.
I'm not looking for solutions to making her sleep longer because I know the cause of her disturbances, but I would like to know if it's possible to permanently damage your own sleep schedule or some reassurance from anyone who has gone through this sort of thing and is now back to sleeping normally as DC are older.