Energy at NIGHT!!!!

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Does anybody else get energy at night? During the day I'm always so tired but at around 7pm I get so much energy and I can't go to sleep early. I have 3 kids. (8,2, and a 3 week old) Is there anything that I can take to give me energy during the day? I feel so bad when I take naps and my daughter and son are up watching tv by themselves.