This study revealed that there was a drastic difference between the levels of cortisol and melatonin -- two hormones responsible for regulating your body’s sleep pattern -- between those who slept with masks and those who did not.
Those without sleep masks had significantly lower levels of these two crucial hormones.
As a result, they were more likely to be woken up, and also experienced worse sleep quality than those who wore the masks.
The study also confirmed that those who wore sleep masks experienced an increase in the length of their REM cycle.
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