OK. I get it. Take a deep breath. Relax. Rest. You fill your days and nights with activity... and then you need time to re-charge. Like a battery. I mean, you expect and think that your energy is like a battery, and if it's a battery, it's the re-chargeable kind...
You know it's not "infinitely re-chargeable" but you lose count of how many times you have re-charged, and you anticipate, you count on, the idea that the process will work once again... you can't even contemplate the "dead-battery" state of your existence...