The heatwave in the UK is set to continue as temperatures reach a sizzling 32 degrees C in some areas.
Parts of the UK could reach 33 degrees C (91.4F) between today and Thursday, which is hotter than top European holiday destinations such as Marbella, Mykonos and Tenerife.
The mercury will remain above 31 degrees C (87.8F) during the week, with forecasters suggesting the next few days could be the hottest of the year.
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In England on Sunday, 31.6 degrees C (88.88F) was recorded at Heathrow, overtaking Saturday's record-breaking 30.3 C (86.54F) recorded in Coton in the Elms, Derbyshire.
Wales recorded 30.2 degrees C (86.36F) in Cardiff, compared with 29.6 degrees C (85.28F) reached in Usk, Monmouthshire, on Saturday.
The Met Office has also issued an amber extreme heat warning for parts of Wales, all of south-west England and parts of southern and central England, while Public Health England has extended its heat-health warning, which warns people to take measures to stay cool and look out for vulnerable people, until Friday.
With this in mind, many people will attempt to stay cool by using a fan.
Auto energy switching service Migrate estimates almost half the population use electric fans to help them stay cool during the hot, summer nights, reports the Mirror.
Their figures suggest, overall, that means electric fans add £1.7 million a day to UK energy bills.
But on an individual level things are far more reasonable - with the typical electric fan costing just 7p to run for 8 hours.
This is worked out based on the output of a typical fan (70W) with the average unit cost for electricity being around 18p.
Of course, if you don't want to use a fan - or discover you can't get one - there are other ways to stay cool.
Other methods of avoiding restless nights include opening a bedroom window, sleeping without bedcovers, sleeping in separate beds, freezing or filling a hot water bottle with ice water, and switching to a lower tog rated duvet.
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