It can be tough to find earmuffs for sleeping. There aren't many products out there that can cover your ears and reduce sound but still be comfortable to sleep in. The massive headphones that are worn at construction sites or in recording studios will effectively cancel out sound but will be incredibly uncomfortable to lay on a pillow with. Ear plugs usually don't successfully knock out all the noise around you, especially if it's someone snoring just a few inches away. However, there are a few sleeping earmuff products out there, though they must be searched out if you want to actually purchase and use them. The list below should help you find these earmuffs for sleeping much more easily.
Hibermate is one of the first sleep mask products that is designed to not only block out light in your eyes but also comfortably block out sound from your ears. These cushy products are like a series of small pillows shaped to pad your eyes and each ear. These ear pads are also easily removable. The Hibernate was developed by Chris Thomas, a guy who used to work night shifts and needed something to allow him to sleep throughout the day to get his body clock back to normal when he wasn't working. So he simply invented the Hibernate and has been selling it over the past few years through his own website. You can't get it in stores because he wants to retain all of the profits, so you will have to go to his own personal Hibermate website to get these unique masks.
This online earplug superstore sells just about every product that is widely sold to keep people from hearing things while they sleep, including sleeping earmuffs. They literally have earmuffs for everyone you can think of, for children and babies to adults and the elderly to even dogs. These earmuffs come in all colors and brands and are reasonably priced because the website doesn't have the same overhead as a retail store would. That said, you will need to pay attention to how much these earmuffs cost with shipping and handling tacked onto them. You also don't have the advantage of trying these earmuffs on to see if they really do block out all the noise you need to sleep properly.
Rather then pinpointing where to purchase earmuffs for sleeping, you can also get on some of the larger retailers online and see what they have in stock, as different businesses and individual sellers are posting different products on a regular basis. Check out Amazon, which is the largest online retailer, for sleep earmuffs first and then move on to eBay and Google Shopping to see what types of products and deals come up. Even if you don't find exactly the sleeping earmuffs you are looking for, you can get an idea of what types of products are out there and how much they generally cost. Then you can check back over the next few weeks until you find the sleeping earmuffs that are perfect for you.