Why do you sleep in rainy days?

Here's the thing. On rainy days, the humidity in the air is relatively high, so the air is full of water vapor, that is, gaseous water molecules. In this way, according to the amount of water, the content of oxygen molecules will be reduced to varying degrees. The oxygen that people depend on can't be fully inhaled in time, so the brain will be deprived of oxygen. People's reaction to hypoxia is yawning, so they are sleepy ~ ~ So it's best to sleep late on cloudy days, hehe.