If the gliclazide constantly gives hypos then it should be considered by your nurse/dr to be reduced. Maybe you're low carbing so your excellent diet is reducing your need for excessive meds? Keep a good diary of bgs for your nurse, incase of amendment.
Snacks are encouraged in none insulin producers. (Type 1 and type 2s who aren't making their own insulin).
I use a snack even thou I do produce my own insulin as I am severely insulin resistant and can have very high liver dumps. My evening supper/snack is to block my liver dump. This snack prevents glucose being released from the liver, muscles and other organs in times of fasting. (Through the night). Fasting during the day can cause a liver dump too. I take insulin for severe insulin resistance. Everyone is different. Try introducing a small snack e.g a few almonds or few cubes of cheese and see how your hypos bode?
Gliclazide can cause hypos.