While I was traveling from hostel to hostel there seemed to be one thing that was constant. I usually stayed in a room that had other people that were staying in the same room. Most hostels put you in a random room with 4-8 other people that you have never met. Some people are friendly and some people are not. It seemed that some people would be cool and try to be quiet and respect if you were sleeping or some people would turn on all the lights and talk and not care.
One thing that I did not have while I traveled the world was a flashlight! I can't tell you how many times throughout my trip that I had wished I had brought one. I would have probably had used a flashlight every day on my trip if I had one.
While staying with 4-8 other people in one room it seems that somebody was always sleeping throughout the day or night. It seemed that when I would need something out of my bag that somebody would be sleeping and would have the lights out in a room. I always felt bad about turning on the light so I would crack the door and look through my bag with no lights. Let me tell you...this doesn't really work. Most of the time I would end up making a ton of noise, dropping things, and eventually turning on a light.
I would highly recommend bringing a small flashlight with you on any trip that you might be staying in a hostel. It doesn't have to be expensive or big. Just a simple flashlight that goes on a key chain works. Tech Tools sells key chain flash lights for $4.99. Something simple like this works anywhere at anytime. To be honest with you, you can probably pick up a key chain flash light at any gas station.