You can make unlimited referrals. So, technically you can earn enough gift vouchers that you do not ever have to pay for a pillow or a mattress protector or a mattress topper ever again.     

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.