Is there any replacement for a good long night sleep?

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Hi mylotters. I'm kinda confused of what I am doing. While everybody are sleeping I am working and if they are wide awake them i am sleeping to complete my 8 hours of sleep. I see to it that I can drink 3-5 glasses of water, take my snacks around 3am and eat my breakfast(which is times 2 for lunch)before i go to sleep around 9-10am. My girl friend told me that there is no replacement for a good long night sleep. Do you agree to that statement?