The hour before sleep has its own architecture.

Two hours of evening blue light delays the body's circadian phase by over an hour and reduces melatonin production by more than half. The hour after sunset is when the body expects darkness to begin. Screens, overhead lighting, and hotel room fixtures override that signal.

Dusk Frames filter at 480nm, the wavelength most responsible for melatonin suppression. The amber CR39 lenses are set in a bio-acetate frame. The material is plant-derived and ages with the warmth of natural tortoiseshell. One size. One colourway.