It could be the cheese per se, or it could be an excess of calcium. Many people find when they start supplementing with magnesium that they sleep better. Calcium and magnesium work in conjunction and also antagonistically so the proper ratio is important.

I've been reading about insomnia and low carb diets and have seen various discussions and suggestions, such as:

• Don't eat protein at least 2-3 hours before bed.

• Eat majority of the day's carbs in the evening.

• Take magnesium. Some people find magnesium stimulating and some not, so some experimentation may be in order as to what time of day to take it.

• Take magnesium and manganese, or eat foods that contain them such as sunflower seeds, pumpkin seeds, chocolate.

• In some cases, when below moderate (approx 50 grams) low carbing, take potassium, and sodium too. See this board re salt: http://forum.lowcarber.org/showthread.php?t=445775

• Coconut oil before bed. (Something about how it works in the liver).

• 
  Apple cider vinegar before bed. ?

Both of these articles are interesting:

The Biochemistry of Insomnia http://www.hypoglycemia.asn.au/2011...ry-of-insomnia/

Thirteen tips for a great nights sleephttp://www.nutritional-healing.com....0nights%20sleep

The above 13 tips article says:

Avoid tyramine containing foods (bananas, avocado, cheese, sour cream, pizza, fermented dairy products, beer, wine, MSG, fermented soy products, pickled salamis, liver, caviar, beans) after 5 PM as tyramine alters brain neurotransmitter levels inhibiting sleep.