Your doctor may not want to say it, but I will.
You never have a flare-up after a good night's sleep or when you stay away from your TRIGGERS.
When you know what your triggers are, you can do something about it. Food, polluted environment, bad air, mold, bad lifestyle habits and lack of sleep can all be contributing factors to your chronic illnesses...
But even if you fix all of them and ignore the stress in your life, your condition will only get worse.