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With Mattresses Must Be Safe Bunk beds are a great space-saving solution. However, the most important thing to remember is that bunk beds that have stairs or ladders need to be securely secured and made of durable materials to ensure safety. Additionally, mattresses must be low-profile so that the children's bunk bed mattress surface stays at least 5 inches lower than the top of the rails. Some bunk beds have trundle options to sleep three easily, which is ideal for sleeping