# Sperm Whales Use Bubbles for Restful Vertical Sleep

Researchers observed sperm whales blowing bubbles while sleeping vertically, a behavior that may help them stay near the surface for breathing. This discovery sheds light on the unique adaptations of these deep-diving mammals for rest in the ocean.

**Importance:** 2/5

## Sources

### Technology
- [Hacker News](https://news.st-andrews.ac.uk/archive/sperm-whales-blow-bubbles-to-achieve-restful-vertical-sleep/) — Fri, 24 Jul 2026 23:13:18 +0000