Flies spend most of their time sleeping at night. The temperature is cooler during the night, so they find a cozy place to rest. They sleep deeply, but not too deeply, which allows them to stay alert in case of predators. Flies also need sleep at night because their brains use a lot of energy during the day. This activity includes learning, which is why flies need a restful night to recharge.
Most flying insects migrate during cold months to warmer climes. The cold temperature slows their metabolism. They also can’t find food, and they become vulnerable to predators. The colder the temperature, the less active the flies are, which makes them easy prey for predators.
While mosquitoes can fly at night, most types of flies don’t. Mosquitoes have super-sensitive antennae and eyes that can see in the dark. Because of this, they can annoy you if you’re sleeping. But that’s not the only reason why most flies don’t fly at night. The temperature is cooler during the day, and flies have to sleep more during the colder seasons.
Flies prefer warm weather and the sun. They rest at night and start hunting for food as soon as the sun comes back up. They leave their colonies and rest under leaves and other vegetation.