New Delhi, Dec. 3 -- On December 2, US President Donald Trump appeared to struggle to stay awake during a Cabinet meeting. It was soon after he claimed, "I am sharper than I was 25 years ago". Several video feeds showed him with his eyes closed for an extended period.

A similar scene occurred on 6 November, when he spent nearly 20 minutes battling drowsiness in the Oval Office. There have also been other occasions this year when he was seen with his eyes closed.

These clips have sparked memes, such as 'Dozy Don' and 'Sleepy Don'. A 2020 study explored the effects of Trump's sleep time. Here's what it found.

Donald Trump seemed to sleep less than he did earlier in his first term. Analysts tracked his "late nights" by checking the time o...