Nervous about NAD+

I ordered NAD+ that will arrive next week. I ordered it because it was recommended for irritability and anxiety. I have learned recently that it can be difficult to inject because it causes a strange feeling. Are the injections weekly? Also, I’m concerned about sleep. I tend to wake up in the middle of the night trying to solve problems in the day. I will definitely inject in the mornings but can it cause insomnia? I do have melatonin. Just anything you tell me to educate me would be great.