Birds look better, are healthier, and behave better under the full spectrum of light. Just like human beings, birds also need enough sunlight to process vitamin D. Vitamin D is essential for the regulation of phosphorous and calcium in the bird's body. However, when it comes to sleeping with the light on, light can have the opposite effect.
The Need for Darkness
Most of parrot and parakeet bird species originate from the tropical areas. In those places, they usually experience 12 hours of darkness and 12 hours of full daylight. Generally, birds need dark sleeping time like humans and light and other activities will keep your bird awake. This is because the bird's instincts are to stay awake during the day as the predators might be present.
Lack of proper sleep due to light during sleeping hours will lead to stress, and that might contribute to changes in behavior like screaming and biting. You might also observe some health problems due to sleep deprivation. Lack of sleep can also lower a bird's immune system.
Avoid having lights on during a bird's sleeping time. Consider providing a small cage that you place it in a dark corner of your busy house to allow birds to sleep in peace. If there are no movements at night in the normally busy areas of your home, you can cover the cage for 10 to 12 hours while your bird is sleeping.