narcolepsy
"I have been taking this medication for 2 months and let me tell you how stupid I am. DO NOT EVER LEAVE YOUR MEDICATION IN THE HEAT OR HUMIDITY.  I kept leaving my medication in my car because I didn't want my girlfriend's brother to steal it. When Xyrem is left out in the heat it becomes less effective. If my narcolepsy is not treated I become severely bi-polar to the lack of sleep. I almost had to go to the mental hospital before I read a note in my new package proclaiming Xyrems ineffectiveness due to heat. Low and behold, I took my new batch of Xyrem last night and felt decent this morning."