National Sleep Foundation

Glossary

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Bedwetting (sleep enuresis) - A parasomnia defined as recurrent, involuntary voiding of urine during sleep. Sleep enuresis is diagnosed as a disorder if it occurs chronically (i.e., at least twice per week) and does not respond to conventional therapies.

Behaviorally-Induced Insufficient Sleep Syndrome (ISS) - A hypersomnia involving chronic, voluntary sleep restriction, resulting in Excessive Daytime Sleepiness (EDS) and fatigue. Common causes include working long hours, shift work, and engaging in other activities (i.e., TV, device use) instead of sleeping.

Beta waves - Occur during daily wakefulness and have the highest frequency and the lowest amplitude, compared to other waves. These patterns also show a lot of variability.

Bilevel Positive Airway Pressure (BiPAP) - A refinement of Continuous Positive Airway Pressure (CPAP), BiPAP permits independent adjustment of the air pressures delivered during inspiration and expiration. The equipment can sense when the patient tries to exhale and drop its pressure accordingly.

Bruxism - A sleep disorder characterized by grinding and/or clenching the teeth during sleep, usually also associated with sleep arousals.