I’ve taken gabapentin and stopped using it because of the drowsiness and blah feeling I had during the day, but I was also taking it during the day back then. I stopped taking it. Then I went back on just 100 mg at night after a fall resulted in some minor fractures of my pelvis (now healed) and I was not sleeping well at all although I also suffer from insomnia and poor sleep overall. Like you, I felt drowsy during the day even on that small dose. I decided that maybe it took some time to be in my system to work and I started taking it early evening at 8 PM instead of around 11 PM, closer to bedtime. That has worked much better for me for sleeping during the night although I still seem to end up getting up for 1-2 hours at some point in the wee hours before going back to bed and to sleep, but it’s curtailed the sleepiness during the day. I don’t know when you take yours, but if you’re taking it late, you might try taking it earlier and see if it helps with the daytime drowsiness.