The best way to start your day? The science backs naked cartwheels in the sun

A new book published online on June 9, 2026, in Nature, titled "The dazzling book explains our bodies’ dependence on sunlight for everything from sleep to skin and bone health," details the scientific basis for sunlight's crucial role in human health. The book elaborates on how exposure to sunlight influences circadian rhythms, impacting sleep patterns and overall well-being. It also highlights sunlight's essential function in vitamin D synthesis, which is vital for bone density and immune system function. Furthermore, the publication delves into the less-discussed effects of sunlight on mood regulation and cognitive performance, citing research that links adequate light exposure to reduced risks of seasonal affective disorder and improved alertness. The author emphasizes that modern lifestyles, often spent indoors, lead to widespread light deprivation, contributing to various chronic health issues. The book advocates for incorporating safe and regular sun exposure into daily routines, suggesting that even brief periods outdoors can yield significant health benefits. It also addresses the importance of balancing sun exposure with protection against harmful UV radiation, providing guidance on optimal timing and duration for safe sunbathing. The scientific evidence presented underscores the profound and multifaceted impact of sunlight on physiological and psychological health, challenging the prevailing notion that sun exposure is primarily a risk factor.