Not dealing well today

Okay, I'm really not dealing well with my kids today. I have a massive headache (thinking maybe I need caffeine) and they have not napped at all in 2 weeks. I'm tired. They're tired. It's not a good combination. I'm not even getting quiet time like I normally do. They will not stay in the other room watching a video even. I'm feeling like a horrible parent with all the yelling I'm doing today. I just want them to give me an hour of quiet time. That's all. Is that so hard? It's almost 5pm and that means only 2 hours until quiet time before bed. I'm counting down the hours. Does that make me a bad mommy?