Your brain wakes up hungry for novelty, and a feed is engineered novelty. Scrolling first thing sets your stimulation bar at slot machine level before breakfast and starts your stress response before you have stood up. Willpower fails because right after waking you run on pure habit.
The fix is friction, applied the night before: charge the phone across the room or outside the bedroom, bury social apps and log out of the worst offenders, and use blocking where the unlock costs real physical effort instead of one tap. Then give the first thirty minutes a shape, water, daylight, coffee, and one small task, so the vacuum does not refill itself with a phone.
Related: the fifteen minute starter routine and goob's focus mode, which keeps chosen apps locked until you tap your phone on a device across the room.