Is the feeling of tiredness a chemical feeling the brain releases? Or something else

Is feeling tired a chemical just like feeling happy is a chemical on the brain?

Yes,because the brain produces
more than 50
identified active
drugs. Some of
these are
associated with
memory, others
with intelligence,
still others are
sedatives.Some of it includes Serotonin is a
chemical that helps
maintain a "happy
feeling," and
seems to help
keep our moods
under control by
helping with sleep,
calming anxiety,
and relieving
depression. The
brain also makes
Dopamine, which
makes people
more talkative and
excitable.I hope you are now relieved.Take care

There are two types of tiredness.
1) Physical
2) Mental
Physical is due to physical activity leading to release of local vasodilators, tissue metabolites etc. Muscles enter anaerobic phase in this case.
Mental tiredness involves CNS!

Body needs rest. When you are tired your body is out of balance between the time it has to rest and the time it can be doing activities, either physical or intellectual.

Being tired means you have to rest, either sleep or stop exerting force.