If you've ever booked a city break and come home more exhausted than when you left, a new ranking might change how you pick your next destination. Luggage brand Eminent has scored ten European cities on how well they set you up for proper rest — factoring in noise pollution, light pollution, air quality and overnight summer temperatures — and Iceland's capital has come out comfortably on top.

Reykjavik earned a sleep score of 99.2 out of 100. The clincher: an average summer night-time low of just 8.9°C, well within the cool range sleep experts favour, combined with remarkably low noise and light pollution and some of the cleanest air on the continent. While southern European cities struggle with 'tropical nights' that never dip below 20°C, Reykjavik's cool evenings practically invite a deep sleep.

Stockholm takes second place with a score of 96.11. Not a single one of its 92 summer days qualifies as a tropical night, and the Swedish capital keeps light and sound pollution low, scoring 27 out of 100 on that combined measure. Ireland's Cork rounds out the top three, followed by Kaunas in Lithuania and Gothenburg — Sweden's second entry.

The rest of the top ten leans decidedly northern and Baltic: Vilnius in sixth, Stavanger in seventh, Edinburgh in eighth, Belfast in ninth and The Hague in tenth. Notably, there's not a Mediterranean city in sight.

The study arrives as sleep tourism booms. Eminent cites it as a $690 billion global industry, forecast to add another $400 billion by 2028. As one of the company's travel consultants put it, wellness trends have long covered diet and fitness, but sleep is the next frontier — and unlike a gym routine, sleep depends heavily on your surroundings: outdoor temperature, street noise, even air quality. Picking a city where those basics are already working in your favour gives your trip a head start.

For travellers, the takeaway is practical rather than gimmicky. If rest is the point of your getaway — or you simply want to avoid the 3am wake-up in a stuffy, noisy room — the ranking suggests looking north. Reykjavik offers the added pull of geothermal pools, dramatic volcanic scenery and long summer daylight (pack an eye mask for the midnight sun, since low light pollution cuts both ways in June and July). Stockholm and Gothenburg pair cool nights with archipelago swimming and strong café scenes, while Cork, Kaunas and Vilnius deliver compact, walkable centres at gentler prices.

Whether you plan your holiday around a 'sleep score' or not, the list doubles as a handy shortlist of quieter, cleaner, cooler European capitals — cities where the biggest thing keeping you up is deciding what to do the next day.