Researchers tracking two wild African elephants in Botswana found they slept about two hours per day on average, with occasional waking periods close to two days. The field study used movement sensors rather than brain recordings, so it measured sleep timing but did not directly identify sleep stages.
TLDR: A 35-day field study in Botswana tracked two free-ranging African elephants and estimated that they slept about two hours per day. Their sleep came in irregular bouts, sometimes after nearly two days awake. Movement sensors revealed sleep timing, but researchers did not record brain waves or directly measure sleep stages.
For 35 days, researchers followed two free-ranging African elephants through Botswana’s Chobe National Park, recording movement and sleep without keeping them in captivity. Published in 2017 in Current Biology, the study found they slept about two hours daily on average—the lowest daily total reported for any mammal at the time. On some occasions, an elephant stayed awake nearly two days. It offered a rare field measure and highlighted limits of zoo observations.
The field team fitted each elephant with a GPS collar and an activity sensor attached to its trunk. Because an elephant’s trunk is usually moving while it is awake, extended periods of stillness gave researchers an indirect way to estimate sleep. GPS data also showed where the animals travelled and how movement related to rest. Tracking let the team study them as they roamed, fed and responded to changing conditions, rather than at a fixed observation site. However, the method relied on movement as a proxy, not a direct measure of sleep.
The findings differed from earlier observations of captive elephants, which suggested they typically sleep for several hours a day. In the wild, the two animals slept in short bouts rather than settling into a long, regular night’s rest. Their sleep was irregular, with stretches of wakefulness lasting as long as 46 hours, followed by sleep. Captive settings can provide predictable access to food and a protected place to rest, while free-ranging elephants must accommodate travel and other demands. The contrast does not prove captivity alone explains the difference, but shows why observations in one setting may not describe another.
The elephants travelled as far as roughly 30 kilometres in a day. Sleep timing appeared to shift with their surroundings and activities, including movement and potential disturbances. This flexibility may help explain how wide-ranging animals balance rest with finding food, staying with social groups and reacting to threats. An elephant covering distance or responding to danger may not follow a consistent daily schedule. The small sample, however, cannot establish that all wild elephants sleep this way. Two individuals cannot represent the range of ages, sexes, social circumstances or environments across elephant populations, and the study covered only 35 days.
The sensors measured movement, not brain activity. Sleep stages, including rapid eye movement (REM) sleep, are identified most directly through brain and muscle recordings. Stillness cannot reveal which stage an animal is in, and a motion-based estimate cannot fully distinguish sleep from every quiet period. Based on sleep in other mammals, researchers inferred the elephants likely entered REM sleep when they lay down, but did not record their brain waves in the field. The study therefore provides evidence about sleep duration and timing, not a complete picture of neural activity. Direct recordings could add detail, although collecting them from freely moving wild elephants presents practical challenges.
The work demonstrates how researchers can investigate a neuroscience question without removing animals from the conditions that shape their behavior. It also raises questions about how sleep needs vary among species and how disturbance affects rest. If similar patterns appear in more animals, researchers could test whether limited sleep is typical of wild elephant life or a response to particular circumstances. Larger studies using additional tracking methods could examine whether the pattern holds across populations, seasons and habitats, and clarify what conditions allow elephants to get the sleep their brains require. Repeated monitoring could distinguish individual variation from wider patterns and show how changes in movement or disturbance coincide with rest.
Ethan Blake serves as a Senior Correspondent for Just Right News, where he specializes in Longform Narrative and Public Understanding. In an era of rapid-fire headlines and fleeting soundbites, Ethan’s work stands as a testament to the power of deep-dive reporting and the importance of contextualizing the complex issues facing the nation today. His approach is rooted in the belief that the most profound truths are often found in the lived experiences of individuals rather than the abstract theories of distant policymakers.
Growing up in Providence, Rhode Island, Ethan developed an early appreciation for the historical and cultural threads that weave the American fabric together. Providence, a city defined by its industrial heritage and its blend of traditional neighborhoods, provided him with a front-row seat to the challenges and triumphs of the American working class. This upbringing instilled in him a respect for the “common sense” values of hard work, community loyalty, and the preservation of local institutions. He learned early on that behind every economic statistic or legislative debate, there are real families and neighborhoods navigating the consequences of change.
This foundational perspective is the driving force behind his signature feature series, “Lives Behind the Systems.” Through this series, Ethan explores the intersection of individual agency and institutional structure. Whether he is documenting the impact of federal land-use policies on rural families or examining how shifting educational standards affect local school boards, Ethan’s work prioritizes the human element. He seeks to uncover how large-scale systems—be they governmental, economic, or social—affect the daily lives of citizens, often advocating for a return to local control and personal responsibility.
Now based in Portland, Maine, Ethan draws significant inspiration from the rugged independence and self-reliance that define the region. The coastal landscape and the resilient spirit of Maine’s communities serve as a constant reminder of the importance of individual liberty and the strength found in decentralized power. Living and working outside the traditional media hubs allows Ethan to maintain a grounded perspective, ensuring his reporting remains untethered from the echo chambers of the major metropolitan centers. This geographic distance provides him with the clarity needed to translate complex national narratives into stories that resonate with the heart of the country.
At Just Right News, Ethan’s beat is more than just a professional assignment; it is a mission to foster a more informed and engaged citizenry. He believes that a free society depends on the public’s ability to understand the mechanisms of power and the value of traditional American principles. His longform narratives do not merely report the news; they provide a roadmap for understanding the cultural and political shifts of the modern era through a lens of skepticism toward centralized authority and a deep respect for the individual.
Through his meticulous research and narrative craftsmanship, Ethan Blake continues to bridge the gap between policy and the public. His work remains a vital resource for those who seek a deeper understanding of the systems that shape our world and the enduring spirit of the people who live within them.