The majority of Hypnos mattresses should be turned ‘Seasonally’ once every 3-4 months – at this time we recommend that you turn and rotate the mattress. We would also suggest that for the first 3 months of use the mattress is rotated and flipped weekly just to encourage an even settlement of the high quality fillings. Your retailer will be able to advise you if your mattress is not a Seasonal turn mattress.