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“If you’ve always been able to sleep through the night, but are now struggling, it could be due to a thyroid problem,” says Caleb Backe, Health & Wellness Expert for Maple Holistics. “If you have an overactive thyroid, it means you're producing an excess of triiodothyronine and thyroxine. This can overstimulate your nervous system and prevent you from falling asleep or even staying asleep.”