A sharp decrease in insulin demand for me lately

[IDemo]

It's common for me to have to adjust dosages with the change of seasons, but I have recently had to chop my Humalog bolus in half and the night-time Lantus basal by nearly a third. I've had Type 1 for 52 years but have never experienced this before. While it sounds better than the reverse - having to greatly increase dosages, something just doesn't seem right this time. I have gone from 11 units of Humalog before meals to 5 or 6, and even then will frequently have a drop in BG level afterward.

In looking at a few sites, both kidney failure and thyroid conditions can cause this. My recent lab work showed no sign of renal damage. No changes for me in either diet or activity level.

Has anyone else here experienced this?