Most recently this happened when I fed the Hobbit some egg whites. I had introduced egg whites to the hobbit about 1 week into our GAPS intro diet (she was already eating the yolks reaction-free). The next day she woke up before 5 and screamed until it was time to get up even though I was there trying to comfort her the entire time. Her naps were also destroyed, running anywhere from 30-45 minutes. After removing the egg white from her diet and giving them a couple of days to get out of her system, she went back to sleeping until about 6:30 and taking an adequate nap. I had noticed a similar disrupted sleep pattern in both kids a couple of weeks before when I had tried giving them peanut butter, and was all too familiar with the potential for food to disrupt sleep due to Grendel waking up daily at 4 am for 3 years until we removed gluten from her diet and she started sleeping in until 6.
Last week I decided since the Hobbit had been egg white free for a few weeks, and since we had all been undergoing extreme gut healing during this time (more on that later), that it was the perfect time to try an egg white diet challenge. Grendel had been asking for weeks when they could finally have GAPS pancakes. I had been putting it off since one of the ingredients was eggs. But I figured the Hobbit might be able to handle egg whites and that making omelettes or scrambled eggs might ease my cooking load a bit. I set out over the next few days to feed us all pancakes, omelettes, scrambled eggs, and eggs cooked into the middle of stuffed peppers. At first she didn't seem to react. Then again, for the first couple of days she would eat the other foods on her plate and would leave the eggs untouched. Around the third day she finally got extra excited about eggs and ate way too many, and the next morning she woke up at 4:30 screaming. That afternoon she took a 30 minute nap. She continued with this sleep pattern the rest of the week. She was constantly tired and cranky. I was tired and cranky as I was only getting 4-5 hours of sleep since I was staying up late to cook after getting the kids into bed. Grendel was tired, cranky, and somewhat monstrous since she was being woken up each morning by a very loud and very angry toddler.
Finally, after a few days, the eggs were out of the Hobbit's system and she started sleeping until 6. She started taking 1.5 hour naps. Grendel started sleeping enough again because she wasn't being woken rudely and prematurely. I started sleeping more since I wasn't dealing with two cranky kids. Needless to say, this is a much happier household this week and I plan to wait a very long time before reintroducing egg whites.