Insomnia is a condition of sleepiness. Symptoms of Insomnia can be listed as follows:

​

• Difficulty to sleep at night;

​

• ​Difficult to return to sleep;

​

• Low concentration and poor memory when in study or at work;

​

• Feeling tired and low energy after waking up in the morning;

​

• Unhealthy lifestyle;

​

• Stress and anxiety;

​

• Environment that may cause poor sleep such as noise, uncomfortable room temperature;

​

• Physical conditions such as pain in body.