For most people, getting 8 to 9 hours of sleep increases concentration, improves physical health, and improves one's mood.

That is true because when you wake up in the morning after getting enough sleep that night you have a lot of energy and you are ready to start the day. 

That’s true. Adults should get at least 7 hours of sleep every night. Getting less than that makes you tired, irritated, mean, you might fall asleep every once and a while and that can cause a lot of issues

Wat r u trying to