Sperm Whales Blow Bubbles to Sleep Vertically

Sperm whales have been observed using bubble curtains to facilitate restful vertical sleep, a finding reported by researchers at the University of St Andrews. The study, which tracked the whales with acoustic sensors and underwater cameras, shows that the animals blow large volumes of bubbles to create a physical barrier that reduces the impact of ambient noise and turbulence while they rest. Unlike most mammals that sleep in a horizontal position, these whales are able to sleep with their bodies oriented vertically, a posture that appears to be supported by the bubble curtain.

The bubble curtain acts as a sound‑absorbing shield, dampening the acoustic environment around the whales and allowing them to maintain a state of deep, undisturbed sleep. The researchers recorded that the bubbles are produced in a rhythmic pattern, forming a continuous curtain that surrounds the whale’s body. This behavior may also help the animals conserve energy by reducing the need for constant vigilance against predators or prey in the dark depths of the ocean.

The discovery provides new insight into the complex sleep strategies of large marine mammals and highlights the importance of acoustic conditions for their well‑being. The article has attracted attention online, garnering 15 points and a single comment on a discussion thread hosted by Y Combinator, indicating growing interest in the ecological implications of the findings.