The other night, I came home from work exhausted. I walked the dog, fed her, put food in my mouth, grabbed a beverage from the fridge, took my usual dose of melatonin, and went to bed.And then the Andrews Sisters' rendition of "Chattanooga Choo-Choo" played over and over again in my head for the next eight hours.Then it was time to get up.Granted, I do sometimes have significant problems with insomnia. There is, after all, a reason I even have a "usual dose of melatonin." But even on bad nights, I typically manage to drop off at least a little, even if it's only for half an hour. No sleep at all is not the usual order of things.It wasn't until I was stumbling around that morning trying to create the appearance of being a sentient person-shaped clump of meat that my brain snagged on the beverage can on the nightstand.Spindrift. Contains fruit juice.Grapefruit.