Glossary
NSDR (Non-Sleep Deep Rest)
NSDR is an umbrella term, popularized by neuroscientist Andrew Huberman, for guided-relaxation protocols such as yoga nidra and body scans that produce rest and recovery without actual sleep. It is used to lower physiological arousal, restore focus afterward, and offer a rest option when a full nap is not practical.
NSDR, short for Non-Sleep Deep Rest, is a modern label rather than a new technique. It groups together several long-established guided-relaxation practices, most notably yoga nidra and the body scan, under one plain-language name. The common thread is that you stay lying still and awake while attention is guided through the body and breath, letting the nervous system settle into a rest state without crossing into actual sleep.
People reach for NSDR for a few practical reasons: to decompress in the middle of a demanding day, to recover focus when energy dips, or to wind down in the evening. Sessions typically run ten to thirty minutes, and because no sleep is required, they fit into gaps where a nap would not. Research suggests short structured rest can support recovery and attention, though the term itself is newer than the practices it covers, so evidence is still catching up to the popular framing.
SYLO fits this pattern by generating a guided session from your own reflection rather than handing you a fixed recording, so a mid-afternoon reset and a bedtime wind-down are not the same script. It stays a wellness practice, not a treatment. SYLO is a wellness tool, not a medical device, and you can read more about the evidence on our science page.