If I were getting low BG at 3am or 5am I’d think I had too much basal at that time of day, rather than a carb ratio problem, because the carb ratio number should only affect me for a few hours after a meal bolus. So I’d reduce my basal slightly starting about 2 hours before the drop, to see if that helps, and if the problem continues I’d adjust it again after 2 or 3 days until it’s dialed in.
But I don’t know if the twiist has some algorithm that uses the carb ratio to affect things other than a meal bolus—that could make it more complicated to figure out what’s going on.
@andrea8 I don’t understand the system you’re using and I’m not a doc, so don’t make any changes on my opinion, but I’m with @bkh. My understanding, ICR (carb ratio) using the Twisst pump (uses the FDA approved version of Loop AID software) shouldn’t be impacting your BG while you’re asleep. Rather, the basal rate in effect at the time (or some small period prior) should be the setting that affects BG and would probably impact more directly. The other setting I’d check is the desired BG target at the time, if its settable in the Twisst AID (I believe its settable in Loop, not positive about the Twisst version). My two cents for your consideration, but YDMV.
@Terry Thanks for the info! I think I’d read that, but didn’t take the time to look it up and wasn’t sure it had been maintained. Taking your stated range and presuming its settable by time of day, an adjustment of target BG could be considered and would depend on what @andrea8 or others have it set at. That said, I’d recommend a basal adjustment first, test it for a couple days, then consider adjusting it further or changing the BG target for the time periods a low occurs (presuming the lows are consistent as to time). I think its important to change only one setting at a time by a relatively small amount so you know what’s working. And it all depends on how “low” is “low”. I’m sure others here have opinions/facts on what’s most appropriate and will weigh in.