You cannot reliably fall asleep in 1 second
Lie down in a dark, quiet room
Put your phone away
Close your eyes
Relax your jaw
Drop your shoulders
Unclench your hands
Breathe in slowly through your nose
Exhale slowly through your mouth
Keep your breathing steady and gentle
Try a calm mental image
Avoid caffeine and screens before bed
Keep a consistent sleep schedule
If you cannot sleep often, talk to a doctor