The correct answer is the peripheral nervous system.
In vertebrates, there are two main parts of the nervous system, that is, the central nervous system and the peripheral nervous system. The central nervous system comprises of the spinal cord and the brain.
On the other hand, the peripheral nervous system comprises basically of nerves that are bounded bundles of axons or long fibers, which associate the central nervous system to each part of the body.
Your brain sends signals to your body to release hormones that make you tired. This is done as a routine, and trying to sleep at different times will mess it up.
Hope this helps!
It can be C or D but I think the answer is D
Answer:
I think it's c but I can't be for sure...
sorry if I'm wrong
Explanation:
No need for Brainlist I am probably wrong. I'm an idiot qwq