Early-night serial awakenings as a new paradigm for studies on NREM dreaming.
Valdas Noreika, Katja Valli, Hetti Lahtela, Antti Revonsuo
International journal of psychophysiology : official journal of the International Organization of Psychophysiology October 1, 2009 DOI: 10.1016/j.ijpsycho.2009.06.002 (opens in new tab) via PubMed
Summary
AI-generated from the abstractA new experimental paradigm called Early-Night Serial Awakenings (ENSA) was tested to assess its usefulness for studying NREM sleep dreaming. Five participants spent 20 nights in a sleep laboratory and were awakened every 24 minutes during Stages 2 and 3 of NREM sleep. Out of 164 awakenings, 30% produced dream reports, 39% reports of white dreaming, and 31% reports of dreamless sleep. Sleep EEG power, dream recall frequency, and dream complexity remained stable across sessions. The authors conclude that ENSA yields static, content-limited dreams and could help reveal the psychophysiological mechanisms of simple early-night NREM dreaming.
Study at a glance
| Characteristics | Experimental paradigm Peer reviewed |
|---|---|
| Sample size | 5 |
| Population | Participants in a sleep laboratory |
| Intervention | Early-Night Serial Awakenings |
| Duration | 20 experimental nights, sessions lasting on average 193 minutes |
| Key finding | ENSA produces static, content-limited dreams with stable EEG and recall across sessions. |
Abstract
A new experimental paradigm called "Early-Night Serial Awakenings" (ENSA) was explored to find out its strengths and weaknesses for psychophysiological studies of NREM sleep dreaming. Five participants spent 20 experimental nights in the sleep laboratory, and were serially awakened with approximately 24-minute intervals during Stages 2 and 3 of NREM sleep. As a total, 164 awakenings were conducted during the sessions that lasted on average 193 min. Altogether, 30% of NREM sleep awakenings led to dream reports, 39% to reports of white dreaming, and 31% to reports of dreamless sleep. Results also show that sleep EEG spectral power, dream recall frequency as well as dream complexity remained stable throughout the serial awakening sessions. We conclude that, as ENSA dreams appeared to be static and very limited in content, the paradigm we identified could be used in future studies to reveal the psychophysiological mechanisms of relatively simple forms of early-night NREM sleep dreaming.