These types of articles are everywhere and I wish they'd spend more time explaining how to tell if you're getting enough sleep

I've tried everything I can to measure but I cannot see an improvement between 8 vs 6 hours of sleep. I opt for 8 because these article scare me but I actually feel worse than with 6.

I don't drink coffee or alcohol and I fall asleep within 10 min of going to bed. Is it at all possible that I'm getting what I need with 6 hours?