Does the curtains not block out light have an impact on sleep

Is it harmful to the eyes to sleep without curtains blocking the light
The place where you sleep gives you a warm feeling of a nest. When you return home at night, you usually close the curtains to create an independent and warm space. When you sleep, you also feel surrounded and feel at ease.
Not pulling the curtains may have a potential impact on sleep and is not beneficial for protecting personal privacy. However, if you don't need to wake up early the next day, you can sleep until you wake up naturally. If you don't pull the curtains, it may be disturbed by the bright sunlight in the morning. Not pulling the curtains may also cause the human body to catch cold and wind during specific seasons, which requires daily attention.
Will curtains not block out light affect melatonin secretion
Non shading curtains affect melatonin. Not turning on small night lights during sleep, not placing illuminated decorations such as fish tanks in the bedroom, and using blackout curtains all contribute to the production of melatonin.
Melatonin is a hormone secreted by the pineal gland of the brain, which can control the body, lower body temperature, blood pressure, pulse, and make the body and mind feel relaxed, making it easy to fall asleep.
Melatonin is more easily secreted in darker environments, which can be inferred that receiving bright light stimulation can lead to shallow sleep, leading to the growth of appetite hormones and corresponding obesity.
If living in an environment with light outside the window, blackout curtains can be used. There are many shading fabrics suitable for making curtains, such as cotton or flocked fabrics, which are easy to wash and replace and suitable for use in bedrooms. Like flocked fabric curtains, the curtains made of it have the function of insulation in winter and summer, with good privacy and even sound insulation.
How to add a layer of curtains without shading
1. Install a shading cloth on the side of the curtain near the window glass, and the hook of the shading cloth can be hung in the same hole as the curtain hook.
2. Install a layer of shading film on the window glass to help enhance the shading effect.
3. Install a curtain with better shading effect in the curtain, or add a roller shutter.