Optimize your nocturnal sound environment by limiting disturbances and exploring tools like pink noise to support memory, while respecting our brain's vigilance system inherited from evolution.

noli's read

The idea that our brain maintains asymmetric vigilance in a new environment, known as the 'first-night effect,' is scientifically validated. An experimental neuroimaging study by Masako Tamaki and her team, published in Current Biology (2016), indeed demonstrates that one of our hemispheres remains more reactive to suspicious sounds during our first night in an unfamiliar place, an ancestral surveillance mechanism comparable to the unihemispheric sleep of marine mammals. Furthermore, the impact of nocturnal noise pollution on cardio-metabolic stress is well documented by large observational analyses and WHO reports, which associate transport noise with increased cardiac system fatigue and a rise in stress hormones. However, the claim that pink noise stimulates memory must be strongly qualified. While small laboratory pilot studies (such as that of Dr. Roneil Malkani in 2019) show benefits with sound stimuli precisely synchronized to slow brain waves, rigorous research published in 2026 in the journal Sleep by Dr. Mathias Basner reveals that pink noise played continuously (such as that from consumer applications) can actually disrupt deep sleep and REM sleep, thereby impairing recovery and memory consolidation.

the sources

1. 1Lan L, Tsuzuki K, Liu YF, Lian ZW. 2017
2. 2Brown TM et al. 2022