![At Sky Cave Retreats in Oregon in the US, guests are exposed to a small amount of light during therapy sessions. Photo: Sky Cave Resorts](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/4YZ5ZM4NY5B47NZQ3TZJCMULKQ.jpg?smart=true&auth=a7e57efc9f7257823add35f666d77da8bd0aebbcc799833d0e0346d48a08d000&width=400&height=225)
At Sky Cave Retreats in Oregon in the US, guests are exposed to a small amount of light during therapy sessions. Photo: Sky Cave Resorts
At Sky Cave Retreats in Oregon in the US, guests are exposed to a small amount of light during therapy sessions. Photo: Sky Cave Resorts
What is a dark retreat? Five places to experience the sensory deprivation wellness trend
We reveal the effects of pitch-black solitude