Good news insomniacs: Science has discovered a supposedly fool-proof way to fall asleep in under 90 seconds.

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Harvard-trained physician Dr. Andrew Weil believes that the stresses of everyday life, coupled with the bright blue lights emitted by smartphones and tablets, mean sleep is often elusive and hard to come by, leaving a nation of tired half-zombies.

So what's his secret?

As Time reports, Weil is a huge supporter of the 4-7-8 breathing technique, an exercise which is meant to calm your body and your mind as you focus completely on your breathing. After all, breathing is one of the core principles of practicing yoga, and great for reducing stress.

Here's how you do it:

1. Place the tip of your tongue against the tissue ridge right above your upper front teeth. Keep it there for the remainder of the exercise.
2. Close your mouth and inhale slowly through your nose while mentally counting to four.
3. Hold your breath for seven seconds.
4. Exhale completely through your mouth for eight seconds.
5. Repeat the same process three more times.

In a nutshell: breathe in for four, hold for seven, and breathe out for eight. Inhale through your nose and exhale through your mouth.

Sweet dreams.

(H/T) Hello Giggles.