K.H.
Hi J.~
I have a 4 yr old daughter who has celiac and is lactose intolerant. I did find putting my daughter on a gluten free and diary free diet helped tremendously with her sleep. There stomachs are not as upset and more settled before bedtime. I can tell you that there is non-dairy milk called Lactose (takes just like milk) and my daughter loves it she doesn't even know the difference. I can also get her to drink vanilla rice milk, I find it tastes better than soy. It is hard but you get used to it. Feel free to email me if you want other suggestions. I also have a milk allergy.
Good Luck
Kristina