Normally you can find the traditional cheap sleep masks on airplanes and at different stores on airports and train stations. These are meant for the random traveller who needs to get some sleep during the flight. They are a great way to block out the surroundings an enjoy a nice high quality sleep while you are travelling. So if you don't want to get constantly disturbed because of the light and possibly even sun shining in your eyes, getting a silk sleep maks is one of the best ways to avoid this. There are a lot of great companies that are making them with the highest quality. These include such as Spa sister, Bed Bath And Beyond, Chris Notti,and Breakfast at Tiffanys. You can get these eye shades easiest online.
Get your sleep mask in advance if you are going to a trip - the discount masks that they sell at regular tourist shops are not that comfortable, and they can make your face sweat and can cause irritation to your skin. Good quality silk sleep masks are not that hard to find, but usually you need to get them in advance, and if you are using them in your home to get a good sleep every night, you need to realize that what you must have is a comfortable product.
There are great advantages in wearing eye shades while you sleep - it is not just about comfortability, and to be able to sleep late in the day, but also about the quality of sleep. If you are not sleeping in total darkness, your body is not producing as much melatonin as it could, and because of this you are not going to feel as rejuvenated as you could after a nights sleep.