Sleep can be disrupted by sleepwalking.
Sleep . Humans may suffer from various sleep disorders , including dyssomnias , such as insomnia , hypersomnia , narcolepsy , and sleep apnea ; parasomnias , such as sleepwalking and REM behavior disorder ; bruxism ; and circadian rhythm sleep disorders . Sleepwalking . Sleepwalking occurs during slow-wave sleep ( N3 ) of non-rapid eye movement sleep ( NREM sleep ) cycles .