Some adult diapers seem to work better than others. any recommendations for nighttime for 115 lb formerly 5'5" thin frame lady. sleeping thru night 92?

Best for you.: No real recommenedation. You should try the different brands and pick one that works best for you based on how dry it keeps you and how well it fits.

Adjustable depends: You are indeed on the slender side--should be proud to have such figure in these days and age. Anyhow, adult diapers are not one-size fits all. You should you look for the ones that are adjustable to allow better fitting/wrapping around your body/frame to minimize leakage. Best of luck.