To manage a caffeine crash, endure the reduced energy rather than increasing caffeine intake, and use sunlight and movement to counteract malaise.

“The key thing is to just manage to get through that crash day, manage to get through that one day where you feel a little less good or maybe even down a bit. Get outside a bit. Get some more sunshine. We know that spikes your cortisol in a good way. It can increase the catecholamines, dopamine, et cetera. Get a little bit more sunlight. Get a little bit more movement. Get outside. Do something to offset those feelings of malaise, and then get right back to your original goal level of caffeine each day.”