The term junk sleep is used to refer to low-quality sleep, usually when fueled by switched-on electrical devices.
The term is coined by an analogy with junk food. It was introduced in 2010 by several students at Wee Kim Wee School of Communication and Information in Singapore. They published an article, where it was told that "using electronic devices right before bed would affect sleep in a negative way". The sleeper cannot get to a normal REM sleep and thereby does not get proper rest. To avoid junk sleep, one should break off usage of digital devices in at least half of hour before sleeping.
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