It has been one month since I kicked my cellphone out of the bedroom. And since that first evening, I've slept an average of one-and-a-half more hours every night. Which means I have slept 42 more hours this month than last month. Or the month before that. Or since I can remember. I'm no good at math, but if I add up the hours of lost sleep over the past, say, five years, I have deprived myself of over 2,500 hours of much-needed rest.

I am staggered by the figures, stunned when I think about where those hours have gone. You see, hours just vanish. You don’t have to be a math genius to understand that time is a kind of currency. A moment is like cash. But it cannot be saved. Only spent.