Double bunk bed size W 1980MM*D900MM. Scientists' research shows that people who sleep in narrow beds turn over more times than those who sleep in wide beds, so they can't sleep naturally. It is also found that the bed width is 500mm when people are going to sleep. Because they need to turn over frequently after sleeping, the relationship between sleep depth and bed width is observed through brain waves, and it is found that the minimum limit of bed width should be 700 mm. If it is less than this width, the depth of sleep will be obviously reduced, which will affect the quality of sleep and make people unable to enter the sleep state. The length of 1980MM can also meet the height requirements of most college students, so the standard size of (800) bunk beds is designed as 1980MM and the width is 900MM.