Answer: Zolpidem (Some trade names of zolpidem are Ambien®, Stilnox®, Stilnoct®, Hypnogen® or Myslee®).OrMirtazapine 7.5mg (Mirtazapine is marketed under the tradenames Remeron® in the U.S. and Finland, Avanza® and Axit® in Australia, Zispin® in the UK & Ireland, Norset® in France, Remergon® in Belgium, Remergil® in Germany and Mirtabene® in Austria.)Insomnia is characterized by an inability to sleep and/or to remain asleep for a reasonable period. Insomniacs typically complain of being unable to close their eyes or "rest their mind" for more than a few minutes at a time. Both organic and nonorganic insomnia constitute a sleep disorder. It is often caused by fear, stress, anxiety, medications, herbs or caffeine. An overactive mind or physical pain may also be causes. Finding the underlying cause of insomnia is usually necessary to cure it.Three different types of insomnia exist. Insomnia may be classified as transient, acute (short-term), and chronic. Insomnia lasting from one night to a few weeks is referred to as transient. This is generally the case for most people, as one often suffers from jet lag or short-term anxiety. If this form of insomnia continues to occur from time to time, the insomnia is classified to be intermittent. Acute insomnia is the inability to consistently sleep well for a period of three weeks to six months. However, after this time, the person does not experience insomniatic episodes. Insomnia is considered to be chronic, the most serious, if it persists almost nightly for at least a month, and sometimes longer.A person can have primary or secondary insomnia. Primary insomnia is sleeplessness that is not attributable to a medical or environmental cause. Secondary insomnia means that a person is having sleep problems because of something else, such as a health condition, an example of which would be generalized anxiety disorder.Some of the most common causes of insomnia are:Circadian rhythm sleep disorders cause insomnia at some times of the day and excessive sleepiness at other times of the day. Common circadian rhythm sleep disorders include jet lag and delayed sleep phase syndrome. Jet lag is seen in people who travel through multiple time zones, as the time relative to the rising and falling of the sun no longer coincides with the body's internal concept of it. The insomnia experienced by shift workers is also a circadian rhythm sleep disorder.Parasomnia includes a number of disorders of arousal or disruptive sleep events including nightmares, sleepwalking, violent behavior while sleeping, and REM behavior disorder, in which a person moves his/her physical body in response to events within his/her dreams. These conditions can often be treated successfully through medical intervention or through the use of a sleep specialist.Gastroesophageal Reflux Disease causes repeated awakenings during the night due to unpleasant sensations resulting from stomach acid flowing upward into the throat while asleep.