Bing found the following results
  1. How to Deal With Sad Feelings | Psychology Today

  2. Seasonal affective disorder (SAD) - Symptoms & causes - Mayo Clinic

  3. Sad Definition & Meaning - Merriam-Webster

  4. Why Am I Sad for No Reason? What Might Be Happening - Healthline

  5. Seasonal Affective Disorder - National Institute of Mental

  6. Seasonal affective disorder (SAD) - Diagnosis & treatment - Mayo Clinic

  7. Sadness: Causes, Coping With It, and When to Get Help - Everyday …

  8. It’s OK to Be Sad: 6 Reasons and How to Manage Sadness - Psych Central

  9. Small Ways to Feel Better When You're Depressed - Verywell Mind

  10. Psychiatry.org - Seasonal Affective Disorder (SAD)