all that disturbs the peaceful sleep, with many a one can still close the window, but that's also not a good solution ...
standard earplugs you have to press forcefully into the ear and always find 2 pieces especially in the dark.
Daydream has successfully managed the problem by the problems associated with a soft drawstring earplugs from the world. the earplugs you put in a similar in-ear headphones in the ear canal and get from the outside world is no longer much with. only that they are still significantly more comfortable in the ear than the often harsh in-ear plugs.
super parts, especially at the price!