I agree with all above but I'd like to know that, first of all, the OP's basal is about right. If his/her basal is not right then the bolus is constantly chasing a moving target.
@hdpiwdpwpdw (getting that address right is a challenge in iself - note to self, play more pelminism!) the basal of Tresiba is a very long duration insulin and it is marketed as an insulin that lasts 40 hrs. So today's Tresiba dose is topping up yesterday's dose. I find that a great advantage - once I've got my Tresiba background right, then I know everything else to manage my BG is done by:
my food and carb counting;
thus my bolus insulin for that food;
my bolus to correct highs;
or small snacks which might not need bolus either as modest BG nudges up or basic hypo corrections;
and my activity or full on exercise levels - which can be very different daily, or mid week from weekends.
These 5 "tools" or "levers" for managing my BG are complicated enough, without trying to use my basal as an extra tool and have a 6th thing to consider in the tool selection process.
Some others have a different view about Tresiba and consider it inflexible; we're all different and do the simplest of things diffferently according to what we've previously learnt or found works for us. Tresiba is what you've been prescribed, so let's work with what you've got.
I was told that basal or background longer term insulin is needed to manage glucose from everything that one's body is doing in the background, just keeping us alive and safe. The shorter duration bolus insulin is for food - managing glucose from the carbs that convert into glucose and are moved into our blood.
Through a 24 hr day various hormones and enzymes can trigger the liver to release glucose from its glucose store. 3 main examples are adrenalin, cortisol and growth hormones; there are others. We are often unaware these glucose releases are happening; or rather we would be unaware if we didn't have finger pricking with glucose test meters and nowadays Continuous Glucose Monitors (CGMs). If we weren't diabetic those glucose releases from the liver would be managed by our pancreas releasing insulin to quickly and routinely move the excess glucose in our blood to the millions of individual body cells and thus into muscles or various organs. Much of those glucose releases can be in the small hours of the night when our brains are often most active doing its housework tasks, while we sleep.
I'm going to pause here. It would be a great help to know
@hdpiwdpwpdw that you do have CGM? How long have you bèn diagnosed T1? After diagnosis did you start on Tresiba as has that been changed at some point? Did anybody tell you anything about out getting your Tresiba basal right first? With a little more info about your background I'd be happy to talk you through how to optimise your Tresiba if that is needed.
