Use your mattress.
Another effective trick: Take a wrinkled garment and roll it as if you were rolling a burrito. Once it’s all wrapped up (wrapped, not folded), put it under your mattress for an hour. Once you take it out, most of the wrinkles should be gone.
Read more: http://stylecaster.com/how-to-remove-wrinkles-without-iron/#ixzz3PLtDqTqB