I am a coffee lover. For some folks,  abstaining from caffeine.as no effect (good or bad) on sleep. For others, any caffeine in any form 6 hours before they intend to go to sleep will predictably disrupt their ability to fall asleep. Try abstaining from caffeine for a day or a week to see what effect (positive or negative) abstinence has on you.

Know your habits and reactions by conducing mini-experiments.

Sleep Tip #243: Go gold turkey by abstaining from caffeine.