A pinch of salt before bed does not help against night-time urination. In 223 people who ate less salt, night-time urination fell from 2.3 to 1.4 times a night. What also helps: looking at what you drink across the day and not staying in bed longer than you need. Regularly up twice or more? Get it checked.
Does salt before bed stop you peeing at night? No, the research points the other way: people who ate less salt got up less often at night. Of 321 people with a high salt intake, 223 managed to cut back and among them night-time urination fell from 2.3 to 1.4 times a night.
My story said the opposite: a pinch of salt would prevent night-time urination. That claim I take back.
Does less salt help against waking up to pee?
It concerns 321 Japanese patients with urinary complaints who got twelve weeks of salt advice. Those who cut back went from 10.7 to 8 grams a day. Those who ate more salt over the same period got up more often. In 74 cardiology patients a smaller study saw the same: from 2.5 to 1 time a night in the 56 who stuck to it.
One caveat: the Japanese study was not a randomised trial. The only randomised trial, in 80 people with type 2 diabetes, found no clear difference after twelve weeks. Those participants already got up less often at the start, so there was less to gain. No study shows that extra salt helps.
The average Belgian eats between 8.3 and 9.4 grams of salt a day. The World Health Organization recommends 5 grams. Only people on a strict keto diet or those who sweat litres lose enough sodium to top up. Even then, the effect on sleep has never been measured.
Source: Matsuo et al.1 2019, Neurourology and Urodynamics; Monaghan et al.2 2020, Journal of Clinical Hypertension; Nakajima et al.3 2024, Journal of Diabetes Investigation; Vandevijvere et al.4 2021, European Journal of Clinical Nutrition (Sciensano, 2018 data)
Want your training and nutrition to adjust to your own data every week? That is what I am building an app for. Join the waiting list
What can you do yourself?
Less salt is one lever. A second is how much you drink across the whole day. In 65 men who drank a lot and cut back to at most 30 ml of urine per kilo of body weight a day, two thirds got up at least once less per night. What they cut back during the day made the biggest difference.
A third lever is your lifestyle. In 56 patients who for four weeks drank less, did not stay in bed longer than needed, moved moderately every day and slept warm, night-time urination fell from 3.6 to 2.7 times. Neither study had a control group, so part of the effect may be expectation.
Source: Tani et al.5 2014, International Journal of Urology; Soda et al.6 2010, Journal of Urology
When is night-time urination a warning sign?
Getting up once a night is common. Research usually draws the line at two or three times a night. A meta-analysis of eleven studies found a roughly 1.3 times higher risk of death in that group. That the urination itself is the cause has not been shown. It is mainly a sign that something else is going on.
One of those causes is sleep apnoea. Of 274 Dutch patients with sleep apnoea, three quarters got up at night to pee. After treatment with a CPAP mask, 42 percent got up at least once less per night. Regularly up twice or more, snoring or tired during the day? Have your doctor check it.
Source: Pesonen et al.7 2020, Journal of Urology; Vrooman et al.8 2020, Neurourology and Urodynamics
A pinch of salt or a supplement is the finishing touch for me. Most of your night's sleep comes down to your structure: go to bed around the same time every day, keep your phone out of the bedroom and skip caffeine in the six hours before sleep.
You need neither a tracker nor fancy supplements. Stick to the basics. The other two claims from my story are covered separately: magnesium and sleep and chamomile tea and sleep.
| Group in the study | Salt intake | Night-time urination | Direction |
|---|---|---|---|
| 223 people who cut back | From 10.7 to 8 grams a day | From 2.3 to 1.4 times a night | Less salt, fewer wake-ups |
| 98 people who ate more | From 9.6 to 11 grams a day | From 2.3 to 2.7 times a night | More salt, more wake-ups |
No study shows that. The research points the other way: in 223 people who ate less salt, night-time urination fell from 2.3 to 1.4 times a night. Those who ate more salt got up more often.
Probably, although the evidence is not conclusive. The large Japanese study was not randomised. The only randomised trial, in 80 people with diabetes, found no clear difference after twelve weeks. Those participants already got up less often at the start.
Once is common. Research usually draws the line at two or three times a night. From that point on, talking to your doctor makes sense.
Eat less salt, drink less if you drink a lot and do not stay in bed longer than you need. In two studies without a control group, night-time urination fell by about once a night.
Timon offers High Performance 1:1 Health Coaching, wherever you live. Coaching clients can also train with him in person in Ghent, Belgium.
Leave a comment below. Say what you think, or tell me which claim to look into. Your comment appears right away and everyone can read it.
What I researched that week, summed up in three sentences, sources included. Unsubscribe any time.
Every number in this article was checked against the original publication.
This article is information, not medical advice. If you have symptoms, are pregnant or take medication, talk to your doctor before changing anything.
Chamomile tea works well as a calming evening ritual. As a sleep aid the evidence is thin: in the only trial in 34 people with chronic insomnia, chamomile extract did no better than placebo. The positive studies used extract in capsules. Allergic to the daisy family or on blood thinners? Check first.
Read the article
Pick an organic form such as bisglycinate or citrate, stay under 250 mg a day from supplements and take it at the same time every day. In a double-blind trial, magnesium oxide was absorbed no better than a placebo. And the effect on sleep is small. That it works mainly in people who get too little is plausible. It has not been proven.
Read the articleYou log, the app reads your trend and moves your targets every week. Training, nutrition, lifestyle and sleep in one plan. On the waiting list you hear first when it opens.
