Yes it would be best to being a sleeping bag and a pillow. There are bunk beds with mattress but it gets really cold and everyone uses the mattress.
Yes bring a sleeping bag and pillow.
Yes sleeping bag a must and extra blanket pillow
Always bring a sleeping bag and pillow. Depending on the time of the year, bring extra blankets too. They provide a bed with now blankets, sheets or pillows.
Yes and maybe a blanket too.
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