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Nighttime removes the external structure that keeps your mind occupied during the day. Without tasks, conversations, and stimuli, your default mode network activates - the brain region responsible for self-reflection, planning, and rumination. This is useful for processing your day, but it can easily become a loop of unproductive worry.
Your brain's default mode network activates when you are not focused on external tasks. At night, without distractions, this network runs unchecked, cycling through worries and plans.
Overthinking is common in anxiety, but everyone overthinks sometimes. It becomes concerning when it regularly prevents sleep or causes significant distress.
Browse all sleep & night anxiety articles, explore mental health guides, see "Is it normal?" articles, get condition-specific support, or read the Paula Blog.
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