How to get more energy?

hi, I'm 24 years old i need more energy, i have about 9 hours sleep every night, i also have 5 kids 6, 5,4,2 and 1 years old, by 12.00mid day comes i am so tired, i need a nana nap then in the afternoon i am tired again, i do not drink tea or coffee, please help i've had enough of being tired all of the time.