On the first day of my world trip I received one of the things that I used almost as much as my Ipod. I received a package of ear plugs. I would highly suggest for you to bring a pair of ear plugs with you on your trip no matter how long you think you are going to be traveling for.
I stayed in mostly hostels during my trip. Most hostels only offer group rooms where there could be 4-10 people in a room. While staying in these rooms there will always be people coming in and out of the room no matter what time of the day it is. No matter how quiet somebody is trying to be they will still be making noise. Most of the time they are opening up and closing locker or taking things in and out of their bags. Nothing could be more annoying while you are trying to take a sietsa (nap).
This is when the ear plugs come into play. Just put them in your ears and it takes care of most of the noise. At least if you can fall asleep before people come in and out of the room you won't be woken up by somebody walking in the room. As a traveler you will learn that a siesta is a part of your lifestyle, and that these ear plugs will be very important to you!