Help please

I really like to scroll reels in the day and I dont know how, but it all catches up to me before I fall asleep, my brain makes all these annoying imaginations of everything ive seen in the day combined and it makes me unable to sleep. Might it be because I have excessive use of mobile phones during the day and before sleep? I'm genuinely in a loss for words, I am so tired due to sports training already, I have been suffering for a few consecutive days already, my body needs rest, but I cant really sleep. Please tell me positive causes or sickness of what is happening and some remedies.