Diagnostic yield of standard-wake and sleep EEG recordings

Sleep influences neuronal excitability and thereby occurrence of epileptic discharges (Burr et al., 1991; Declerck, 1986; Janz, 1962; Marinig et al., 2000; Martins da Silva et al., 1984). Several studies showed that in patients suspected for epilepsy, following normal or inconclusive standard-wake EEG, recording sleep EEG increases the diagnostic yield (Bennett et al., 1964, 1969; Gunderson et al. 1973; Jovanovic, 1991; Niedermeyer, 1993; Roupakiotis et al., 2000) by activating epileptiform discharges (Degen, 1980; Geller et al., 1969; Klinger et al., 1991; Logothetis et al.

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