“If you can’t see sunlight because of your environment then you are going to have to opt for artificial light,” says Dr Huberman. “In that case, you’re going to want an artificial light that either simulates sunlight, or has a lot of blue light.”

That doesn’t mean just scrolling through Instagram, as your phone and laptop won’t produce enough brightness to be effective (although they are enough to block melatonin at night). Instead, Dr Huberman suggests sunlight stimulators or, even better, “the ring lights that people use for selfies as these generate a lot of blue light.”

He also goes on to advise that it’s “50 times less effective to view the sunlight through a window” and that being outside with no glasses on is important. But, that doesn’t mean you should put your eyesight at risk in the pursuit of sunlight. “You don’t want to gaze at the sun or refuse to blink,” he says. You shouldn’t “find that your eyes are watering or [you’re] having challenges maintaining looking at this something for a while.”

Daylight saving time: the benefits of morning sunlight for beating SAD