Doing keto for several years on and off, longest time was two years. While being on keto is absolutely recommended, I haven't seen signifcant impact on sleep quality.

Being on keto reduces your general anxiety. Or being on carbs makes you much more anxious and a doubting person. Maybe there is a small relation: Less anxiety leads to better sleep. In my case, I needed to fix my sleep with other things, keto didn't help there.

OT: I think that from a specific age (mid 30ies+) one cannot just eat carbs and gluten like they did when they were young. At a higher age carbs impact you much more. People get bloated and age way quicker. You see 'high carb' written in their face.

OT2: Not entirely sure if this post's actual goal is promoting the mentioned carb tracker app.

OT3: Maybe a bit extreme but very true is a quote by Talib: 'The three most harmful addictions are heroin, carbohydrates, and a monthly salary'