I haven't been able to sleep for the past few weeks. what is happening?

I can't diagnose the: Cause of your insomnia. However, try using excellent sleep hygiene. Retire ; rise same time each day. Keep bedroom dark ; cool ; use only for sex ; sleep. Turn off tv. No naps. Exercise regularly but not in late evening. No caffeine for 6 hrs ; no alcohol or tobacco w/i 2 hrs of sleep. Keep dinner moderate sized ; finish at least 2 to 3 hrs before sleep. Can try warm milk, chamomile or melatonin.