Why do I get itchy skin at night?

Itching that worsens at night has mundane mechanics first: skin loses more water overnight and warm bedding dehydrates it further, body temperature and blood flow to skin rise in the evening, histamine follows a daily rhythm peaking at night, and once the day's distractions stop, your brain finally notices the itch signal. Dry skin is the top cause - MedlinePlus lists it first among itching causes - and hot showers, harsh soaps, and winter air set it up. Eczema flares follow the same night rhythm, and scabies - itch worst at night with a burrow rash between fingers or at wrists and waistline - is the classic infectious cause, usually with someone else in the household itching too. The routine: lukewarm short showers, thick fragrance-free moisturizer within three minutes of toweling - night is the high-value application - cool bedroom, loose cotton sleepwear, nails short, and an oral antihistamine from the pharmacy when the itch-scratch cycle is ruining sleep. When itching is an internal signal: widespread itch with no visible rash at all, especially with fatigue, weight changes, or night sweats, deserves blood tests - thyroid, liver, kidney, iron, and blood sugar all drive rashless itching. Itch with a spreading rash, with yellowing eyes, or after a new medication also earns a prompt visit. And household-wide night itching gets treated as scabies until a provider says otherwise. Pymander is a free AI doctor, 24/7 by text. Describe where it itches and whether there is a rash, and it can help you sort skin-deep from internal.