My son had a mountain bike accident in April. He severely injured his leg below his knee and had knee surgery in May. He is just now returned to work and is up on crutches. He is suffering from insomnia. He is exhausted, but cannot fall asleep at night. He has expressed some anger and irritability towards his family. What can he do? He has tried relaxation techniques, lavender oil, green tea, Benadryl, etc. Nothing has worked so far. I am very concerned for his mental and physical health.