Andrew Huberman· PhD
If that person were say to set their alarm clock for 5:30 AM, then get up, get some artificial light-- if the sun isn't out, turn on bright or artificial lights, or if the sun happens to be up that time of year, get some sunlight in your eyes. But irrespective of sunlight, were to get a little bit of brief high intensity exercise maybe 10 or 15 minutes of skipping rope or even just Jumping Jacks or go out for a brief jog, what happens then is the cortisol pulse starts to shift earlier.