Review (4/5): I got this for my husband, because he has a problem with getting to sleep.
He especially has trouble getting back to sleep if he wakes up in the night. I heard that lavender oil can help with sleep, so I mainly got the mask as something to spritz lavender scent on. He finds the mask very comfortable and likes the scent of lavender very much, and says he finds it easier to get to sleep and stay asleep when using them. (Personally, I detest the scent of lavender, but it doesn't drift to my side of the bed and stay there, so we're fine!)