Lighting Bookmark~~~ - Poboo

I don't know if you have the experience of reading books in the quilt at night. Others say that reading books at night is the best choice, because you can devote yourself to the environment described in the book. But here comes the problem, reading books in the quilt at night will affect your eyesight, and if you turn on the light, it will affect others. Is there no better way? Our foreign friends have invented this thing - lighting bookmark.