Having trouble falling asleep at night?  You're not by yourself.  Millions of adults worldwide suffer from insomnia, which can have a major negative influence on mood, focus, and long-term brain health.  Although melatonin is frequently used, there are other options as well.  According to recent studies, inadequate B vitamin intake and poor brain circulation may be major causes of sleep issues, and there may be natural remedies that are worth looking into.