In lieu of sunny days, sunrise alarm clocks or light-therapy glasses are a great alternative, mimicking the effect of natural light. Or you could add a light box to your desk — make sure the light is hitting your eyes. “A 10,000-lux light box really benefits your whole system, restoring rhythm and stabilising mood,” says Wolstenhulme. Twenty minutes is enough. Office workers will love the Lumie Task Light (£279, lumie.com), which has adjustable brightness and light direction.
