There is a cold joke in space applications called "I can't sleep and count sheep".

This is a cartoon about an insomniac. His friend (or maybe a doctor who has been forgotten for too long) told him that counting sheep might be effective, and that person began to count sheep. When he counted more than 1000, he fell asleep, but in his dream, he found that he missed sheep 365 and the sheep came to settle accounts with him. As a result, he lost sleep again.