- Insomnia affects 30-50% of the population, with 10% experiencing chronic insomnia. It is very individual in terms of duration. - Common causes of insomnia include jet lag, shift work, noise, temperature discomfort, stress, illness, withdrawal from drugs/medications, and high altitude. - Insomnia impacts daily life through poor concentration, memory issues, social problems, and traffic accidents. - People should see a doctor after 3-4 weeks of insomnia symptoms, but should first try lifestyle changes like regular exercise, sleep schedules, avoiding caffeine/alcohol before bed, relaxing bedroom environment, and not worrying in bed.