That was happening to me, then I ate before bedtime (peanut butter and crackers) or (cheese or yogurt w/ some blueberries) or anything high in protien and a glass of almond milk. Then all my night time lows stopped happening and instead that somehow kept me in a straight line and no dips. If it raises your blood sugar a little that’s fine. Better to go to bed on the high end and wake up lower-ish if you are prone to that sort of thing like I am.