9
In the YouTube video "Why you're so tired," the speaker
explores the causes of modern-day fatigue by comparing our brains to
that of a caveman named Johnny. While Johnny's brain had fewer decisions
to make, ours are inundated with choices, leading to increased activity
in the prefrontal cortex and mental exhaustion. The speaker explains
that glutamate, a neurotransmitter involved in decision-making, builds
up and clogs the system, resulting in mental fatigue. To combat this,
the speaker suggests limiting decisions, taking naps to clear excess
glutamate, and being aware of news perspectives and biases. The speaker
also discusses the importance of proper sleep hygiene , such as avoiding decisions before bed and limiting caffeine intake, to improve sleep quality and reduce tiredness.
Wow i was so tired and i saw this topic. 
No. My b12 and D are above average (mean). Still i am tired.
If you are Tired you can also roll just like a car
One of the reasons is sleep apnea, many of us ignore this but its brutal when it comes to normal day routine.
All you need is an appointment with a pulmonary doc to verify if you've sleep apnea, you might need cpap or bipap, It's messy as so many factor plays the role but these days you simply cant ignore anything related to your body.
