One key to the use of exercise in aiding good sleep is that
a. muscles contain sleep-inducing hormones
b. it is easier to sleep when one is tired
c. delta brain waves are generated by exercise
d. only cardiovascular activities aid sleep

the correct answer is : B. It is easier to sleep when one is tired

When you're body is tired, it will send signals to your brain to slow down your body's activity so it can be recovered since most of your muscle regeneration happen when you sleep This will make you extremely sleepy and aid you in obtaining good night sleep

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