Why does my body feel cold when lying in bed?

Lying in bed with a cold body may be caused by low environmental temperature, thin clothing or bedding, hypoglycemia, hypothyroidism, anemia, etc. This can be improved by adjusting room temperature, adding warm clothing and bedding, or medical treatment. If the feeling of coldness persists or is accompanied by fatigue, dizziness, or other symptoms, prompt medical attention is necessary.

1. Low environmental temperature: Insufficient insulation in the bedroom, with indoor temperature below 18°C, leads to rapid heat loss from the body, causing a sensation of coldness when lying in bed, without other discomforts. It is recommended to adjust the air conditioning or heating system to maintain room temperature between 20–24°C. Additional local warming methods such as hot water bottles or space heaters can also be used.

2. Thin clothing or bedding: Wearing lightweight sleepwear or using thin, poorly insulating bedding fails to retain body heat, resulting in a cold sensation, especially noticeable in the extremities. It is advised to switch to thicker, warmer sleepwear and choose bedding made of down or wool that effectively covers the entire body to minimize heat loss.

3. Hypoglycemia: Going to bed on an empty stomach or with insufficient energy intake causes low nighttime blood glucose levels, reducing the body’s energy supply and heat production, leading to a cold sensation in bed, often accompanied by palpitations, hand tremors, cold sweats, and hunger. It is recommended to consume sugary foods such as candies or biscuits to promptly replenish energy and restore normal blood sugar levels.

4. Hypothyroidism: Insufficient thyroid hormone secretion slows down the body's metabolic rate and reduces heat production, causing coldness when lying in bed, along with symptoms such as fatigue, excessive sleepiness, weight gain, and dry skin. Patients may take medications such as levothyroxine sodium tablets, thyroid tablets, or enteric-coated levothyroxine sodium tablets under medical supervision to alleviate symptoms.

5. Anemia: Reduced red blood cells or hemoglobin impairs the blood's oxygen-carrying capacity, leading to inadequate oxygen delivery to tissues, reduced heat production, and a sensation of coldness in bed, often accompanied by pallor, dizziness, palpitations, and fatigue. It is recommended to use medications such as ferrous sulfate tablets, ferrous fumarate capsules, or ferrous succinate tablets under medical guidance to improve symptoms.

Daily care tips include avoiding going to bed hungry, consuming moderate amounts of warm-natured foods before sleep, soaking feet in warm water before bedtime to promote circulation, choosing breathable and warm bedding, and adjusting the thickness of clothing and bedding according to temperature changes.