Why do astronauts often lose sleep?

Insomnia and sleeplessness are always ' force majeure ' of astronauts, especially when they are in the long-term universe in weightless conditions. The lack of day and night signals made their 'biological clock' useless.

Professor Timothy Monk of the University of Pittsburgh, USA conducted a monitoring of the sleep of some astronauts and noted that on the first days of presence on the space station, most astronauts often adhere to the time regular sleep and wake times, but after about four months, with every day the sun rises 15 times and the sun goes down 15 times, people will gradually lose the feeling of day and night.

Cause because it is dark every 45 minutes and so the normal circadian rhythm no longer exists. Some previous studies have also shown that people who lose their normal morning cycles, including those who are blind, are affected by insomnia, and more sleep time or waking night takes place more often.

NGUYEN SINH