When falling asleep, the body switches from functioning with the active sympathetic nervous system to the calmer parasympathetic nervous system. However, in a state of stress, this transition does not take place and the sympathetic nervous system remains active. As a result, sleep may not be possible, as the body and mind are not adequately relaxed.
Even when it does come, sleep may be very disturbed and unsatisfactory. Acute insomnia is a key symptom of acute stress.
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