The reason you struggle to fall asleep at night is because your brain won't shut off. In the past, during moments of boredom or downtime, your mind had the space to process thoughts, prepare for stressful situations, and remind you of things you needed to do. But now, you fill every idle moment by reaching for your phone. As a result, the only quiet time your brain gets is right before bed. That is when it tries to catch up, running through all those thoughts and concerns, which keeps you awake at night.