Um, we woulda known this. If we ever bothered to, you know, think hard:
SCIENCE PROVES WHAT WE ALREADY SUSPECTED. HARD THINKING REALLY DOES WEAR OUT OUR BODIES, THOUGH WE CAN’T ACTUALLY EXPLAIN WHY
by Mark Wilson
Some days, you leave work at 5 p.m. ready to pick up the kids, make a three-course meal, build a birdhouse, and hit the gym. Others, you walk in the door and collapse on the couch, begging for the sweet release of reality TV to soothe your inexplicably sore body along with a delivery pizza to fuel you up for a particularly intense eight hours of sleep.
Both days your “work” was just sitting at your desk, but one left you far more physically exhausted. Why? Well, were you thinking harder on pizza day?