Anyone tried light therapy?

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I try to use some time doing light therapy every morning if possible, although mostly during the dark months. Part of it is that I struggle with seasonal depression, so at a minimum if helps to have a sunlight-like “treatment” every morning, even if it is placebo. However, I think there is something to the help set circadian rhythm in the morning, and telling your brain it’s time to be up and ready to do things. It’s really hard to quantify something like this though.