orthosomnia noun [U]
UK /ˌɔː.θəˈsɒm.ni.ə/ US /ˌɔːr.θoʊˈsɑːm.ni.ə/
the inability to sleep well, caused by thinking too much about getting enough sleep and by using apps and other technology to measure how much sleep you get

Orthosomnia is a new type of sleep problem that has arisen due to the overload of sleep information thanks to the influx of digital sleep trackers and apps in recent years … In other words, by becoming so dependent upon these devices on their quest to achieve perfect sleep, people with orthosomnia are actually struggling to sleep and may spend countless hours thinking exhaustively about how they cannot optimise their nightly rest.
[greenqueen.com, 9 January 2020]

art acne noun [U]
UK /ˈɑːt.æk.ni/ US /ˈɑːrt.æk.ni/
damage on the surface of paintings in the form of small bumps, caused by a chemical reaction

Some of the world’s finest oil paintings have been self-destructing, developing mysterious lumps and bumps known as “art acne”. Works by Georgia O’Keeffe and Rembrandt are among the hundreds of works blighted by the condition. For decades, art conservators have struggled to control the outbreaks, which look like grains of sand to the naked eye.
[dailymail.co.uk, 17 February 2019]

London throat noun [U]
UK /ˌlʌn.dən.ˈθrəʊt/ US /ˌlʌn.dən.ˈθroʊt/
a mild infection, similar to a cold, said to be common among people who live in London and caused by pollution

Scrapping speed bumps could help protect city dwellers against “London throat” because braking releases toxic dust which may trigger coughs and colds, scientists have said. Urbanites often suffer from intermittent bouts of runny noses and brain fog, which experts have long-suspected are caused by pollution. Dubbed “London Throat”, this ongoing low-level illness can lead to more serious infections such as pneumonia and bronchitis.
[telegraph.co.uk, 9 January 2020]

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