marginal significancep < 10 × 10 −1
Significance tests show that Fourier amplitudes show only marginal significance (10 × 10 −2 < p < 10 × 10 −1 ) for spectral components ( k = 17, 19, 20), whereas phases are found to be significantly different ( p < 10 × 10 −2 ) between control and insomniac groups in slow spectral components ( k = 1, 2, 4, 5, 7).