Sleep, as William Shakespeare wrote in Macbeth, is the “balm of hurt minds, great nature’s second course, chief nourisher in life’s feast”. Little wonder, then, that taking a nap has enduring appeal. Adequate sleep is needed for good health. But how do such behaviours evolve, and what can researchers learn from studying them in primates? Ashbury and colleagues provide insights about the daytime naps taken by wild orangutans (Pongo abelii; A. M. Ashbury et al. Curr. Biol. 2025).
Competing Interests
The author declares no competing interests.
