Sleep can be disrupted by dyssomnia , insomnia , hypersomnia , narcolepsy , sleep apnea , parasomnia , sleepwalking , REM behavior disorder , bruxism , and circadian rhythm sleep disorders .
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 .
Sleep