Hollywood star and two-time Academy Award nominee Mark Wahlberg revealed this week that he wakes at 2:30am daily, launching into a regimen that includes a 90-minute workout, golf, prayer and recovering in a “cryo-chamber”. By 7:30 that night, he’s in bed.

He’s not the only high-profile early-riser. Apple CEO Tim Cook reportedly gets up at 3:45am, and Disney boss Bob Iger has a 4:25am scheduled workout that has apparently inspired NBA players to hit the gym earlier.

On LinkedIn and in profiles of corporate leaders, there’s often a common thread – if you want to be successful, get up early.

So should we all become super-early birds? Would it help us be more productive? It might – but there’s a cost. And possibly a hidden desire to impress people with just how “productive” we are with pre-dawn wake-up calls.