Insomnia cause can be attributed to a variety of factors, such as the use of certain medications, medical conditions, and lifestyle habits. Two common causes of insomnia are DRIP (4 letters) and SNORE (5 letters). DRIP stands for 'Drugs, Restless legs, Infections, and Psychological issues', which are all potential causes of insomnia. SNORE is an acronym for 'Sleep apnea, Neuropathy, Obstructive sleep apnea, Restless legs, and Environmental factors', which are also potential causes of insomnia.