A lot of light at night—for example, from screens or streetlights—can lead to health harms, according to experts including Harvard Chan School's Eva Schernhammer.
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.
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.