Researchers in the UK conducted a metastudy to find out what we know about the sleeping habits of top athletes, reports the Huffington Post.

The researchers focused on symptoms of insomnia, which is characterized by trouble falling or staying asleep, the feeling that sleep wasn’t restorative and excessive daytime fatigue.

Based on these studies, they conclude that about one third to one half of all elite athletes are poor sleepers, with Paralympic athletes reporting the most insomnia symptoms.

“The findings of review revealed high levels of sleep complaints among elite athletes, however, there is little evidence to suggest that these levels are disproportionately higher than those of young, high-achieving non-athletic individuals such as students,” Gupta said.

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