If it's too low early morning, this possibly is not taking place, so glucose drops too low. If this is occurring, I suggest you try taking 4000 to 8000mg/day glutamine at night. This amino acid can be used by the brain in place of glucose, but being an amino it doesn't cause a sharp drop in blood glucose levels.
Sometimes, heat lightning isn't lightning at all, but a cloud reflection of lightning from a very distant storm. In other instances, it is regular lightning which has formed far off in the distance, making a flash instead of a recognizable lightning bolt.
Heat, light, sound and electric energy are all forms produced in a lightning strike. The bottoms of clouds typically become negatively charged, while the earth beneath them becomes positively charged. When the potential difference between the two becomes sufficient to break down the electrical resistance of air, lightning strikes occur.