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Annika Hof zum Berge, Michael Kellmann, Ulf Kallweit, Shakila Mir, Annika Gieselmann, Tim Friedrich Meyer, Alexander Ferrauti, Mark Pfeiffer, Sarah Kölling

• Current sport-scientific studies mostly neglect the assessment of sleep architecture, although the distribution of different sleep stages is considered an essential component influencing an athlete’s recovery and performance capabilities. A mobile, self-applied tool like the SOMNOwatch plus EEG might serve as an economical and time-friendly alternative to activity-based devices. However, self-application of SOMNOwatch plus EEG has not been validated against conventional polysomnography (PSG) yet. For evaluation purposes, 25 participants (15 female, 10 male; M\(_age\) = 22.92 \(\pm\) 2.03 years) slept in a sleep laboratory on two consecutive nights wearing both, conventional PSG and SOMNOwatch plus EEG electrodes. Sleep parameters and sleep stages were compared using paired \(\it t\)-tests and Bland–Altman plots. No significant differences were found between the recordings for Sleep Onset Latency, stages N1 to N3 as well as Rapid Eye Movement stage. Significant differences (Bias [95%-confidence interval]) were present between Total Sleep Time (9.95 min [−29.18, 49.08], \(\it d\) = 0.14), Total Wake Time (−13.12 min [−47.25, 23.85], \(\it d\) = −0.28), Wake after Sleep Onset (−11.70 min [−47.25, 23.85], \(\it d\) = −0.34) and Sleep Efficiency (2.18% [−7.98, 12.34], \(\it d\) = 0.02) with small effect sizes. Overall, SOMNOwatch plus EEG can be considered a valid and practical self-applied method for the examination of sleep. In sport-scientific research, it is a promising tool to assess sleep architecture in athletes; nonetheless, it cannot replace in-lab PSG for all clinical or scientific purposes.