You can refer a friend only if you are an existing customer. All existing mattress customers will be auto enrolled into the program and you will get a personalized link that you can share with your friends and family. Your referral should use the link while placing the order.
To get more details of the referral program, please go through all the articles in this refer-a-friend section here.
Please note that Sunday may discontinue or make changes to the referral program at its discretion and at any time.