It has been reported that blue light emitted from screens directly correlates with a delayed sleep schedule.
Blue light is a type of visual light that emits at a wavelength of 380 to 500 nm. It is often emitted from screens such as smart phones, TVs and tablets and a long-term exposure to it can affect your circadian rhythm.
A study was conducted where 2 groups of 14 healthy young adults aged 19-28 for 8 consecutive days. The results supported that blue light contributes to the slow build-up of sleep need, and circadian sensitivity.
So for better sleep, it is recommended that you stay off your phone at night or use the night shift feature on your phone to reduce blue light emissions. Practice getting off your phone in the evening, and limiting your time scrolling through when you are in bed!