Lifestyle, stress, or even medication can be the causes of your sleepless nights. Even though insomnia is not a disease but just a symptom, you shouldn’t underestimate its impact. Chronic insomnia can make you feel irritable, drowsiness, concentration problem and also weaken your immune system. The sleep phase occupied 1/3 in human circadian rhythm. It is to let our body rest and recover from the damages during the day. This is why sleep quality is very important to teenagers in puberty.