Lack of sleep triggers junk food cravings, research says

We all know we crave junk food when we're tired.

Now, science knows why.
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It comes down to the balance between the hormones leptin, which suppresses appetite, and grehlin, which increases hunger.

The new research says a lack of sleep spikes the grehlin, making us hungry.
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But the ghrelin binds to the same brain receptors as the active ingredient in marijuana, triggering the craving for fatty, starchy, sugary foods, similar to the 'munchies' pot smokers experience.