Olimex OpenEEG: Difference between revisions
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REM sleep is usually easy to identify in the spectrogram, especially within the core of a sleep cycle. REM episodes occur between NREM stages and are marked by a distinctive bow-shaped frequency band around 20–25 Hz near the end of the cycle. | REM sleep is usually easy to identify in the spectrogram, especially within the core of a sleep cycle. REM episodes occur between NREM stages and are marked by a distinctive bow-shaped frequency band around 20–25 Hz near the end of the cycle. | ||
=== Identification in naps === | |||
[[File:Rem beta.webp|thumb|REM nap, beta waves (20–28 Hz)]] | |||
[[File:Wake.webp|thumb|Awake state, no well-defined beta waves]] | |||
[[File:Nrem1 2.webp|thumb|NREM1 and NREM2 during a nap]] | |||
Distinguishing sleep stages during a nap can be more challenging than during a full night of core sleep, but it is still possible. REM sleep is marked by beta activity, specifically in the 20–28 Hz range<ref name="remnrem" />, which helps identify REM naps. | |||
The wake state appears similar but lacks clearly defined beta waves. It typically looks disorganized, featuring high frequencies without a distinct structure. | |||
NREM naps usually begin with NREM1, which appears mostly blank, similar to wakefulness but with a clearer and more subdued pattern, as shown in the third image. The nap then progresses into NREM2. Both NREM2 and NREM3 are characterized by prominent sigma waves (12–16 Hz)<ref name="remnrem" />. Delta waves (0.3–3 Hz) are also present, being strong in NREM3 and weaker in NREM2. | |||
REM naps are most common in the morning hours (between 3–11 a.m.), while NREM naps tend to occur in the afternoon. | |||
== References == <!--T:3--> | == References == <!--T:3--> | ||
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<ref name="nrem">{{cite web |url=https://neupsykey.com/introduction-to-sleep-and-polysomnography-3/ |title= | <ref name="nrem">{{cite web |url=https://neupsykey.com/introduction-to-sleep-and-polysomnography-3/ |title= | ||
Introduction to Sleep and Polysomnography |website=Neupsy Key |access-date=2025-06-22}}</ref> | Introduction to Sleep and Polysomnography |website=Neupsy Key |access-date=2025-06-22}}</ref> | ||
<ref name="remnrem">{{cite journal |vauthors=Uchida S, Maloney T, Feinberg I |date=1994 |title=Sigma (12–16 Hz) and beta (20–28 Hz) EEG discriminate NREM and REM sleep |journal=Brain Research |volume=659 |issue=1-2 |pages=243-248}}</ref> | |||
}} | }} | ||
