Circadian preference
Refers to an individual's natural inclination towards a particular sleep-wake pattern.
Subclinical depressive symptoms
Mild depressive symptoms that do not meet the criteria for a clinical diagnosis of depression.
Behavioral activation system
A psychological system responsible for initiating and maintaining goal-directed behavior.
Reward responsiveness
An individual's sensitivity and reactivity to rewards.
Emotion regulation
The ability to effectively manage and regulate one's emotions.
Rumination
The tendency to repetitively focus on negative thoughts and feelings.
Trait anxiety
A stable tendency to experience anxiety across different situations.
Subjective sleep quality
An individual's perception of the quality of their sleep.
Daytime sleepiness
Excessive sleepiness or a tendency to fall asleep during the day.
Chronic fatigue
Persistent and debilitating fatigue that lasts for an extended period.