A good night's sleep is critical as the brain consolidates information learnt during the day with previous knowledge before filing it for long-term storage.
COVID-19 cases have spread quickly in China after its Zero Covid policy was withdrawn.
The research on 1,276 patients from Wuhan, China, shows that around one in three people still experienced shortness of breath after 12 months, while lung impairments persisted in some patients, especially those who had experienced the most severe illness with Covid-19.
Foreign ministry spokesperson Mao Ning went on the offensive saying "we do not believe the entry restriction measures some countries have taken against China are science-based".
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