A fasting sugar level of around 159 suggests your diabetes may not be fully under control, even while taking Glisen-PM 1. High fasting readings can happen for several reasons, such as eating late at night, feeling stressed, not sleeping well, being less active, irregular meal times, gaining weight, or the natural progression of diabetes. Sometimes, your current dose may not be enough, but your doctor will look at your overall sugar trends and HbA1c before making any changes. It?s important not to increase your dose or change your medication on your own, as this can cause low blood sugar, dizziness, sweating, or weakness. Your doctor will likely review your fasting and post-meal readings, eating habits, kidney function, and lifestyle before deciding if any changes are needed. You can try having dinner earlier, avoiding sugary or heavy late-night meals, staying active, and checking your sugar regularly. Walking daily, getting enough sleep, managing stress, and eating balanced meals with fewer refined carbs can also help improve your fasting sugar levels. Let your doctor know if your readings keep going up or if you notice symptoms like increased thirst, frequent urination, blurred vision, shakiness, or unusual tiredness, even with treatment.