Arousal, in a scientific sense, refers to a state of strong physiological and mental activation. It can be caused by various factors such as pain, excitement, and stress. While activation is beneficial in certain situations, like mobilizing us to seek help when in pain, it can hinder sleep when we're trying to rest. Short-term insomnia often occurs when people try to compensate for lost sleep by spending excessive time in bed, but this only worsens the mismatch between opportunity and ability to sleep. Sleep is not something we actively do, but something that happens when the right situation allows for it, such as the time of day, environment, and our mental and physical state.

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