Yes, anxiety, grief, and depression can cause insomnia, I would say these are the main reasons beyond physical over-stimulation (caffeine, drugs, exercise late at night, etc.). I went through a similar response to sleeping meds where I developed a tolerance. I would suggest trying remedies such as melatonin, valerian root, and herbal teas. Also regular exercise and trying to refrain from stimulants like coffee, tea, soda, and cigarettes. Long term insomnia sucks!
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