Raised sleeper beds are more productive per square foot because plants can be spaced more closely together since you don't need to leave spaced to walk through so never step on the garden bed
Higher density planting enables the plants growing there to shade out bare soil, making it harder for weeds to grow
Sleepers are supplied pressure treated, this will enhance the style and help protect from insect infestation, fungal decay and rot
Supplied as Use Class 4 (INCISED), these carry a 15 year service life warranty