When you think of insomnia you're thinking of someone who can't sleep for a reasonable amount of time. A typical complaint from an insomniac is not being able to close their eyes or rest their mind for over a few minutes at a time. There are many reasons for this ranging from anxiety to bipolar disorder. Yet sometimes there's no real causes and can just happen for any given reason, but too much activity and physical pain can be causes for someone not to be sleeping at night.
Finding the underlying causes is key to finding a cure for this problem. It's also been found that not eating has contributed to someone not sleeping. There are 3 types of insomnia and they are transient insomnia which lasts anywhere from a single night to several weeks, acute insomnia is the inability to sleep well for a single period of 3 weeks to up to 6 months, and chronic is deemed the most serious where it's happening nightly for at least a month or longer.