Cover Page shares in Thousands	9 Months Ended
	Oct. 02, 2021 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 02, 2021
Document Transition Report	false
Entity File Number	000-25121
Entity Registrant Name	SLEEP NUMBER CORPORATION
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-1597886
Entity Address, Address Line One	1001 Third Avenue South
Entity Address, City or Town	Minneapolis,
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55404
City Area Code	763
Local Phone Number	551-7000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SNBR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	22,647
Amendment Flag	false
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--01-01
Entity Central Index Key	0000827187