What is insomnia?What are the main signs and symptoms of insomnia?How is insomnia diagnosed?What are some of the main medical treatments for insomnia?Have any supplements been studied for insomnia?How could diet affect insomnia?Are there any other treatments for insomnia?What causes insomnia?Can melatonin help with jet lag or shift work?Is there any evidence regarding melatonin toxicity, tolerance, and addiction?Is melatonin supplementation safe?Will supplementing melatonin affect my own production of melatonin?How much sleep should I get?How exactly might caffeine mess up my circadian rhythm?How does sun exposure influence sleep?What should you avoid doing before bed?How does alcohol affect my sleep?What is the Pittsburgh Sleep Quality Index (PSQI)?