Contrary to the aforementioned, other colors are less favorable in this matter of inducing rest. Let's see some:

Purple or violet: obtained the lowest result in the study, with less than 6 hours of sleep. It stimulates the mind and creativity, but it is the worst color to sleep.
Brown: just slightly above purple, at 6 hours and 5 minutes. According to the study participants, it is drab, gloomy, unwelcoming, and creates a sense of unease and unease.
Dark gray: 6 hours and 12 minutes. According to the respondents, they feel lonely in rooms with dark gray painted walls.
Red: stimulates the mind too much. This color is also not recommended for the walls of the room, as are the shades of orange.