I had a good evening meal, chicken, pots and 2 veg, followed by yoghurt. My bedtime reading was 10.0. I awoke at 2.30am with a reading of 5.1 which for me is a bit low. Rather than risk a hypo later on in the night, I got up and had a Weetabix. My reading at 8am was 13.9. What did I do wrong?