Night thirst is usually your day catching up: too little water, salty dinner, alcohol, and dry bedroom air.
The NHS lists thirst and dry mouth among dehydration symptoms, with dark, strong-smelling pee as the telltale. Front-load water through the day, ease off evening salt and alcohol, and keep a glass by the bed. The unquenchable version is different: the NHS lists feeling thirsty all the time and peeing more than usual among the most common type 2 diabetes symptoms, and that pairing deserves a GP blood test. Night thirst with loud snoring and dry mouth is also worth a sleep apnoea mention.
What to do
Common questions
Why do I get thirsty at night?
Night thirst usually has a boring explanation stacked from your day. You under-drank all day, ate a salty dinner, had a couple of drinks, and now you are lying in warm, dry bedroom air mouth-breathing a little, and the dehydration signal finally gets your attention. The NHS lists feeling thirsty and a dry mouth among the symptoms of dehydration, along with dark yellow, strong-smelling pee and peeing less often, which makes the self-test easy: your evening pee tells you whether you ran dry all day. The fixes: spread water through the day instead of catching up at night, go lighter on salty dinners and evening alcohol, and keep water by the bed so thirst does not fully wake you. The version to take seriously is the unquenchable one: if you are constantly thirsty day and night, drinking plenty and still parched, and peeing more than usual, the NHS lists feeling thirsty all the time and peeing more than usual among the most common symptoms of type 2 diabetes, and that combination deserves a GP check and a blood test. New heavy night thirst alongside snoring and dry mouth also fits the sleep apnoea pattern worth mentioning.