Grabbing your phone first thing in the morning means you skip the important theta and alpha stages of waking up, priming your brain for distraction and stress for the rest of the day.
Your brain will directly go to a state of alertness (beta brainwaves) too early on, setting the tone for the rest of your day.
➡️ So, start each day with cup of coffee or tea instead of scrolling your phone ;)
References and additional reading:
Wacks and Weinstein (2021). Front. Psychiatry.