and a decrease in heart rate. The typical duration of Stage 1 is around 10 minutes and accounts for approximately 5% of an individual's total sleep. Stage 2 is characterized by a further decline in muscle activity accompanied by a fading sense of consciousness of surroundings. Brain waves during Stage 2 are seen in the theta range. Stage 2 accounts for approximately 45-50% of an individual's total sleep. Stage 3 is the final stage of NREM sleep and the most common for parasomnias to occur. Also known as slow wave sleep (SWS), Stage 3 is characterized by brain temperature, respiratory rate, heart rate, and blood pressure being measured at their lowest. Representing approximately 15-20% of an individual's total sleep, brain waves during this stage are seen in the delta range. When an individual awakes during this stage, they are likely to exhibit grogginess and require up to thirty minutes to regain normal function and consciousness. Diagnosis Though it is not possible for a definitive diagnosis of sexsomnia, a series of factors are considered to determine the presence of the condition. Clinical tests may also be utilized for further study. Determining factors Determining factors include but are not limited to: a family history of somnambulism or sleepwalking prior episodes of somnambulism disorientation when awoken observed confusional or autonomic behavior amnesia of episode trigger factors the individual possesses lack of regard to conceal episode the nature of event compared to the individual's baseline character Clinical tests Electroencephalography Electroencephalograms, or EEG, are tests used to depict electrical activity and waves produced by the brain. This test has the ability to detect abnormalities that are associated with disorders that affect brain activity. Episodes of sexsomnia occur most commonly during slow-wave-sleep, or SWS. During this stage of sleep, brain waves tend to slow down and become larger. Through the use of electroencephalography, health professionals are able to determine if the sexual behaviors are occurring during non-REM sleep or if the individual is fully conscious. Polysomnography Polysomnography is a study conducted while the individual being observed is asleep. A polysomnograph (PSG) is a recording of an individual's body functions as they sleep. Specialized electrodes and monitors are connected to the individual and remain in place throughout study. Video cameras can be used to record physical behaviors that occur while the subject is asleep. Typically, the unwanted sexual behaviors do not present on film and the majority