Sleep vs. Fatigue
A fascinating distinction emerges between sleepiness and fatigue, revealing that someone can feel exhausted without actually being sleepy. Various factors, such as depression or vitamin deficiencies, can contribute to this disconnect. The struggle to achieve restorative sleep often leads individuals to mistakenly believe that better sleep alone will resolve their daytime fatigue, highlighting the complexity of sleep-related health issues.In this clip
From this podcast

Untangle
Encore — Dr. Chris Winter - Why Your Sleep is Broken and How to Fix it.
Related Questions
Why am I sometimes very tired at night, fall asleep easily and quickly, but wake up after 2 hours feeling very tired and have a hard time sleeping again? Sometimes, even if I sleep for 7 hours, I still feel tired because of sleep debt but can't fall asleep properly anymore. I lie in bed for maybe another 30 minutes to 1 hour without falling asleep properly, and then I start my day, even if I am still very tired.
Is it normal to feel tired during the day, or is it a sign that your sleep isn't good?
It's not about sleep but not having enough energy and feeling fatigued and tired during the day.