Plenty of factors can contribute to you developing chronic insomnia. According to Dr. Thronber, your sleep cycle can be disrupted by many things, from environmental factors like noise pollution, to physical and mental health reasons.
He explains that the sleep disorder can be caused by things such as "drug or alcohol abuse; psychiatric disorders like depression or anxiety; medical disorders, and poor sleep hygiene." In addition to that, lifestyle choices can play a major role in the onset of chronic insomnia, Dr. Thornber says, "drinking too much alcohol and caffeine — especially before bedtime — can perpetuate chronic insomnia. Also, over use of mobile and technical devices before bedtime can stimulate the brain and have an impact on sleep."