Sleep and Circadian Rhythms

Signals from our stomach and signals from our skin

Signals from our muscles and signals from our bones

Signals from our body and signals from the environment (correct)

Signals from our brain and signals from our heart

Because our brain is producing more serotonin

Because our environment is sending signals to our brain (correct)

Because our body is producing more melatonin

Because our heart is beating slower

To tell our brain we are tired (correct)

To wake us up

To regulate our body temperature

To make us feel hungry

<p>We feel sleepy</p> Signup and view all the answers

<p>Darkness makes us feel sleepy</p> Signup and view all the answers