Is there enough coffee??Iced or otherwise?

So my brother is on day 3 of his two week vacation at the Jersey shore and I am on night 4 of all Mom, all the time..I am starting to feel the sleep deprivation, so the Keurig is getting a good work out. The problem is knowing when to switch over to decaf so it doesn't screw up the upcoming night's sleep. Didn't realize I need a Masters' Degree in caffeine to keep my head down on a pillow and sleep.