Lost Sense of Lows Again!

I have been having more low blood sugars again and have lost my feeling of going low.I have lowered my numbers in the hope of getting it back.What usually happens is I go high about 3-4 hours after supper.So I take an injection of 1 unit of humolog and I sometimes combine it with a correction bolus.I seem to get back on target about 1 1/2 - 2 hours later but when I check at 2 am. I go low.I recently checked my basal rate at it is good.I am a little upset with myself for allowing it to get so out of hand.