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Diurnal mood variation or morning depression is a prominent [1] depression symptom characterized by gradual mood improvement through the day, reaching its peak sometime after twilight. While the main form of diurnal mood variation presents itself as described, a reversed form, with a worsening of mood towards the evening, also exists. [ 2 ]
And also positive diurnal variation mood (bad mood in the morning, good mood in the evening), [73] sensitivity to negative stimulation and mixed symptoms in some people, etc. [74] [75] Mood swings in post-traumatic stress disorder (PTSD): Mood changes erratically [76] with episodic mood swings rising in the period of recovery process.
People with MDD sometimes show diurnal and seasonal variation of symptom severity, even in non-seasonal depression. Diurnal mood improvement was associated with activity of dorsal neural networks. Increased mean core temperature was also observed. One hypothesis proposed that depression was a result of a phase shift. [30]
Morning types had lower pain sensitivity throughout a day than evening types, but the two chronotype groups did not differ in the shape of diurnal variations in pain. [29] There are some differences between chronotypes in sexual activity, with evening chronotypes preferring later hours for sex as compared to other chronotypes. [30]
Seasonal mood variations are believed to be related to light. An argument for this view is the effectiveness of bright-light therapy. [24] SAD is measurably present at latitudes in the Arctic region, such as northern Finland (64°00′N), where the rate of SAD is 9.5%. [25] Cloud cover may contribute to the negative effects of SAD. [26]
While the National Park Service claimed that the world single-day record is a variation of 102 °F (56.7 °C) (from 46 °F or 7.8 °C to −56 °F or −48.9 °C) in Browning, Montana in 1916, [2] the Montana Department of Environmental Quality claimed that Loma, Montana also had a variation of 102 °F (56.7 °C) (from −54 °F or −47.8 °C ...
In diurnal (day-active) species, exposure to light soon after wakening advances the circadian rhythm, whereas exposure before sleeping delays the rhythm. [11] [12] [8] An advance means that the individual will tend to wake up earlier on the following day(s). A delay, caused by light exposure before sleeping, means that the individual will tend ...
Diurnal variation of mood [9] Hallucination [9] Comorbid anxiety disorders and anxiety symptoms [10] Suicidal ideas or attempts [10] Hostility [11] Rapid Cycling and Cyclothymia (both common features in Bipolar Disorder) [12] However are more likely to: Experience delusions [9] Exhibit formal thought disorder [9]