Answer: A sleep spindle is a particular waveform that is observed in the EEG traces of a person in the early stages of non-REM sleep.
Sleep Spindles: Mechanisms and Functions
Sleep Spindle - an overview
Method description for the automatic sleep spindles detection. First
Frontiers Functional differences in cerebral activation between slow wave-coupled and uncoupled sleep spindles
Sleep Spindles – As a Biomarker of Brain Function and Plasticity
Sleep Spindles in Humans: Insights from Intracranial EEG and Unit Recordings
Sleep Spindles: Mechanisms and Functions
Frontiers A Novel Approach to Estimating the Cortical Sources of Sleep Spindles Using Simultaneous EEG/MEG
Topographical relocation of adolescent sleep spindles reveals a new maturational pattern in the human brain
Frontiers A Novel Approach to Estimating the Cortical Sources of Sleep Spindles Using Simultaneous EEG/MEG
What are Sleep Spindles?
Asymmetry in sleep spindles and motor outcome in infants with unilateral brain injury - Marchi - 2022 - Developmental Medicine & Child Neurology - Wiley Online Library
Sleep Spindles: Where They Come From, What They Do - Anita Lüthi, 2014