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Another sleep trait, Delayed Sleep Phase Syndrome (DSPS) was first identified by Elliot Weitzman and colleagues in 1981. Individuals with DSPS typically cannot fall asleep until later and wake up later compared to control groups. They often cannot fall asleep until between 2:00-6:00am, but then have a normal sleep duration.
In contrast, showers close to the sleep period can be erroneously recorded as sleep. [20] These false positives are relatively common: while actigraphy is good at detecting sleep patterns (sensitivity: 0.965), it has its difficulties in detecting wake periods (specificity: 0.329). [21]
Circadian rhythm sleep disorders (CRSD), also known as circadian rhythm sleep–wake disorders (CRSWD), are a family of sleep disorders that affect the timing of sleep. CRSDs cause a persistent pattern of sleep/wake disturbances that arise either by dysfunction in one's biological clock system, or by misalignment between one's endogenous oscillator and externally imposed cues.
Sleep–wake logs and/or actigraphy monitoring for at least two weeks document a consistent habitual pattern of sleep onsets, usually later than 2 am, and lengthy sleeps. Occasional noncircadian days may occur (i.e., sleep is "skipped" for an entire day and night plus some portion of the following day), followed by a sleep period lasting 12 to ...
A sleep disorder, or somnipathy, is a medical disorder of an individual's sleep patterns, in some cases affecting physical, mental, social and emotional functioning. [1] Polysomnography and actigraphy are tests commonly ordered for diagnosing sleep disorders.
In cats, the sleep cycle lasts about 30 minutes, though it is about 12 minutes in rats and up to 120 minutes in elephants (In this regard, the ontogeny of the sleep cycle appears proportionate with metabolic processes, which vary in proportion with organism size. However, shorter sleep cycles detected in some elephants complicate this theory).
Advanced Sleep Phase Disorder (ASPD), also known as the advanced sleep-phase type (ASPT) of circadian rhythm sleep disorder, is a condition that is characterized by a recurrent pattern of early evening (e.g. 7-9 PM) sleepiness and very early morning awakening (e.g. 2-4 AM).
These can start at 1 week, occurring weekly or fortnightly, until 8 years of age due to innate and external factors that contribute to sleep. [ 3 ] Developing infants also sleep within a large spectrum of sleep — falling into high and low needs categories — fragmented through 24 hours.