the present invention is an adjustable height bed side guard device and method to reduce the risk of a child from falling out of bed while sleeping and help wean or transition a child away from needing a bed side guard . the bed side guard height can be adjusted and reduced or raised in set time intervals , providing a simple , step - by - step process to help a child become confident as well as subconsciously accustomed to being in a bed . the device comprises at least one elongated bolster with two or more connected layers that are assembled on top of a conventional mattress and secured in operative position along one side of the mattress by a conventional mattress pad or fitted bed sheet covering the mattress and the bolster and is tucked under the mattress . multiple devices may be used to provide further security on all sides of a bed .