Red light is by far the best calming light color for sleep. Choosing a red light as a nightlight ensures that you don't disrupt your circadian rhythm. So switching to a red light a few hours before going to bed will surely help you fall asleep easier.

What color LED lights are best for sleep?
This means that red, green, and orange-toned lights are the best for inducing sleep as they create a conducive environment for your body to produce the sleep hormone melatonin. If you also experience restlessness before or during sleep, studies show that having warm-toned LED lights help you feel more relaxed.
What color of Light Makes you Sleepy?
1 Blue or white light – this type or color of the light makes us feel more energetic and more likely wakeful if exposed to... 2 Red or amber light – this light is the most likely to impact our circadian rhythm and makes us sleepy. Red or amber... More ...
How does LED light affect sleep?
The Oxford Sleep and Circadian Neuroscience Institute conducted a study about LED light’s effect on mice’s sleep patterns. The research revealed that the mice exposed to purple light showed a delay in sleep, with the mice’s onset of sleep taking 10 minutes in contrast to green light, which took 3 minutes.
What are the benefits of red or amber light for sleep?
Here are some of the most prominent benefits that red or amber light for your sleep; Natural melatonin production – red light is shown to help the body produce more melatonin when compared to other types of lights, like blue light.