Do yourself and your loved ones a favor and read this book.

Proper rest and sleep helps keep a body strong and healthy. Or better put how poor sleep increases risk of heart attack and diabetes (and many other diseases). How swing shift workers have far higher rates of disease.

Learn about how NREM/REM helps the hippocampus and the pre frontal cortex help each other to improve memory. Why studying without proper sleep is a waste of time because you cannot recall the data. It has nothing to do with concentration which is relatively unaffected...

How dementia is related to a lack of sleep in older patients.

Its the best book I've read this year.

Its Summer and you have time

Why We Sleep by Matthew Walker

you'll be glad you did