Let's say you have a planet tidally locked to its star (a red dwarf), with an atmosphere that makes it habitable around the area halfway between the point closest to the star and the point furthest away. All the life in this area would live in perpetual twilight.
Could life very similar to humans survive such an existence? I'm specifically wondering what the effect would be on our bodies of always being in the sun, but at the same time never having full sunlight, only a setting sun. Would our skin need to be different? Would we have evolved to need less sleep (being that it's always light and therefore we would always be able to do work so sleeping is less practical)?