I agree with “Tim2000s”
I had a serious problem with unexplained nocturnal hypoglycemia incidents when I was using Lantus, and they came quite often. Likewise, I felt that its absorption was not steady… I could feel it when spiking (although it is a flat insulin, it does spike) and the spikes gave me dizzy spells.
Tresiba is a beautiful insulin. Very smooth, I was using it for 2 years and couldn't be more in love with it.
The problem with Tresiba, however, is that, once it’s in, it’s in. So, if your basal needs are different in the morning and different in the evening, you cannot split Tresiba as it is a 48 hour insulin. In my case, I had excellent results during the day but kept feeding it during the night to avoid hypos. Also, keep in mind that Tresiba is more “aggressive” than other insulins. You will need less units of Tresiba than of Lantus or Levemir. Likewise, as Tim said, if you are active then Tresiba can be a pain… activity “enhances” its power and you can drop to a low level easier than with other insulins.
I am currently on Levemir because I can split and adjust the dose which seems a suitable scheme for my case as I do not need the same amount of basal insulin throughout the 24 hours.
I used to take 18u of Tresiba. I am currently at 19u of Levemir (combined 2 doses) and it is still hardly enough as my levels are very high (but, I keep searching for the correct dosages).
Therefore, I do agree with Tim. Maybe it would be better to abandon Lantus altogether and look for a better alternative in Levemir or in Tresiba.