I've had CFS symptoms on & off for many years, including a 2 year period where I could barely work at all. These days I have enough daytime energy to work, play, and live fairly normal. But every night, right around 9-10PM, I get a sudden-onset crash, where without warning, all the energy drains from my body, my brain gets foggy and can't think or articulate too well, my arms feel weak to the point of painful, and my balance gets stumbly enough to make me bump into the furniture on the way to my bedroom. And I go into a terrible emotional state, filled with relentless anxiety & dread, even though everything currently in my life is fine and I have nothing to be anxious about. Almost like a severe low-blood-sugar attack, except it can occur even when I just ate a full well-balanced meal 30 minutes ago, so...can't be that. Maybe cortisol levels, I don't know. Once all those symptoms have kicked in, I can't fall asleep naturally...too much physical and psychic pain...so I often resort to a small dose of Klonopin to help me. It works (it takes an anguished hour) and most of the symptoms give way to feeling fairly peaceful again about an hour later, and after a full night's sleep, I'm fine all through the next day till I crash again the following night. I don't want to keep taking Klopnopin, and the only other remedy seems to be to hit the sack around 8-9PM, before the crash strikes. I can do that, but it's hard 'cause I enjoy my evening activities with my family and don't want to make an abrupt exit from the movie or conversation just 'cause the clock says it's 8:30 Anyone else have this, or know what the cause could be?