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by mnsc 2338 days ago
This SciShow-clip discusses this study and others.

https://youtu.be/HsonXuJs8-s

I do it most mornings for (anecdotal) "waking up the mind" when I'm tired. Sometimes it feels like the world goes from SD to HD. I don't do it 90 seconds though more like 30 tops and I don't believe that I'm less sick because of it. For me it's also a psychological test of "can I chose to do something that is tangibly uncomfortable when it's super easy to just stay nice and cosy".