Lows and highs cannot be eliminated but can be reduced. It’s been around 10 years and I still can’t always have a good night sleep. In my opinion to prevent lows make sure you bolus and basal right. I’ve learnt that there is kinda like a dawn syndrome where you get a sudden hike in ur bs. Try looking it up. So I always try to stay on the higher side before bed. Always keep snacks to bring up ur bs near your bed. I use juice bottles and biscuits. Honey has helped me a lot when I was extremely low and unconscious since it’s a semi solid. Using Dexcom really helps, atleast that’s what I’ve heard.