If you get headaches or have other symptoms of low blood sugar, 90% of the time it will be because you are not eating enough. First-time slow-carbers are accustomed to eating small portions of calorically dense carbohydrates (think bagels or pasta), and they duplicate the portion sizes with the calorically lighter slow-carb foods, resulting in insufficient calories. Expect that you can eat two to three times as much volume, and assume that you should.
Likewise, if you have trouble sleeping due to hunger, you're not eating enough. In these cases, consume a bit of protein prior to bed, which can be as simple as 1-2 tablespoons of almond butter (ideal) or peanut butter with no additives (the only ingredients should be peanuts and perhaps salt). Note to the ladies, for whom peanut butter seems to be like crack: the tablespoon scoop should be no more than a small mound, not half the jar balanced on a spoon.
Likewise, if you have trouble sleeping due to hunger, you're not eating enough. In these cases, consume a bit of protein prior to bed, which can be as simple as 1-2 tablespoons of almond butter (ideal) or peanut butter with no additives (the only ingredients should be peanuts and perhaps salt). Note to the ladies, for whom peanut butter seems to be like crack: the tablespoon scoop should be no more than a small mound, not half the jar balanced on a spoon.