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Too much light at night may harm health
(hsph.harvard.edu)
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this post was submitted on 17 May 2026
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You don’t need DIY fingers for basic blackout curtains.
As long as the blinds aren’t completely in the way, a tension rod (spring loaded curtain rod) is cheap and just slips into place wherever you need to fit it.
The blackout curtains/sun block curtains I've recently seen use sticky tape and velcro to block out virtually all light. I've done it, but you have to have someone somewhat tall (I'm 5'11) to get the corners. They use a solid block of fabric, not blinds, to block out everything.