winter solstice and insomnia

Key Takeaways Winter Solstice and Insomnia: What You Need to Know When is the Winter Solstice? In the Northern Hemisphere, the winter solstice occurs every year on Dec. 21 or 22.  According to Wikipedia: The winter solstice, also called the hibernal solstice, occurs when either of Earth’s poles reaches its maximum tilt away from the Sun. This happens twice yearly, once in each hemisphere […]