Many possibilities: Insomnia has many causes, ranging from stress to caffeine, side effects of medications, hormonal imbalances such as hyperthyroidism or excessive cortisol levels & hypersensitivity to electromagnetic fields. But passing out at random times is a serious problem that could be caused by sleep disorders such as narcolepsy or sleep apnea. I strongly suggest evaluation by a specialist in sleep medicine.
Answered 12/20/2012
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