Insomnia generally refers to the condition of sleeplessness that affects one's life and health. However, one or two nights of sleeplessness doesn't mean you are struggling with insomnia. A clinical insomnia would last for at least 3-7 days. Also, clinical insomnia can be differentiated into chronic and acute sleeplessness. While insomnia can be a serious condition that can lead to the rise of several other physical and mental conditions, you might feel relieved to learn that it is curable when you can cure the underlying cause.