Why do I wake up freezing at night?
Last updated September 3, 2026.
Core temperature bottoms out in the early hours, so you wake cold even in a room that felt fine at midnight. Layers within reach, seasonal bedding, and socks solve the normal version. The patterns that matter: freezing plus drenched in sweat suggests fever swings; freezing with shaking, sweating, hunger, and palpitations fits low blood sugar, which heavy drinking or exercise without eating can trigger per the NHS; and feeling cold around the clock with fatigue, weight gain, and constipation is the underactive thyroid cluster, which a blood test checks. Drenching sweats, fever, or weight loss join the list of GP reasons.
What to do
- Keep extra layers and socks within reach; the 4am chill is physiology.
- Note sweat patterns; freezing-then-soaked points to fever, not bedding.
- Cut heavy evening alcohol if waking shaky, sweaty, and hungry.
- Ask for a thyroid blood test if you are always cold with fatigue and weight gain.
Related questions
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