Meditation and NSDR are two different tools

By Ronen Shapiro · Last reviewed 2026-08-05 · How this is sourced

They get used interchangeably and they should not be. One is associated with structural change in the brain over weeks of practice; the other shifts your autonomic nervous system inside a single session. Knowing which one you need is most of the benefit.

Runs in your browser, nothing to install. The bell is a struck bowl, not an alarm — ending twenty minutes of practice on a beep undoes the twenty minutes.

Meditation: the slow, structural one

Sara Lazar’s 2005 MRI work found that 8 weeks of Mindfulness-Based Stress Reduction was associated with measurable thickening of the prefrontal cortex, insula and anterior cingulate cortex — regions involved in attention and interoception. The key detail is the timescale: this is an 8-week-plus effect, not something a single session delivers.

• Lazar et al., NeuroReport, 2005. View study

NSDR: the fast, autonomic one

Non-Sleep Deep Rest — Yoga Nidra, body-scan and similar guided protocols — shifts autonomic balance toward parasympathetic "rest-and-digest" dominance within a session. That makes it the right tool after hard training or in a mid-afternoon dip, where a 20-minute seated meditation is not what you need.

• PubMed 22866996 (2012). View study

The inflammation finding

Mindfulness practice has been associated with reductions in NF-κB — a master regulator of the inflammatory response — and in pro-inflammatory cytokines including IL-6 and TNF-α.

• Creswell et al., Psychoneuroendocrinology, 2016. View study

What the timer gives you

Set any duration, choose a soundscape, and get an optional halfway bell so you can stop checking the clock. Ending bells are gentle rather than an alarm. Like the interval timer, it keeps running if you put the phone down and leave the screen.

Common questions