Objective　The　weight-adjusted-waist　index　(WWI)　is　a　novel　measure　of　central　adiposity,　potentially　linked　to　various　sleep　disturbances.　This　study　explores　the　relationship　between　WWI　and　sleep　outcomes,　such　as　trouble　sleeping,　sleep　disorder,　and　sleep　duration.　Methods　Data　from　the　National　Health　and　Nutrition　Examination　Survey　2007-2012　were　analyzed,　including　13,494　participants.　The　analysis　focused　on　individuals　aged　20　years　and　older　who　provided　information　on　WWI　and　sleep.　Sleep　status　was　determined　based　on　responses　to　the　following　questions:　(1)　＂How　many　hours　do　you　sleep?＂;　(2)　if　they　reported　trouble　sleeping;　and　(3)　if　they　had　physician-diagnosed　sleep　disorders.　Regression　models　assessed　the　association　between　WWI　and　sleep　outcomes　across　the　entire　population　and　within　subgroups.　Restricted　cubic　spline　(RCS)　analysis　was　conducted　to　examine　potential　non-linear　relationships　between　WWI　and　sleep　outcomes.　Results　A　higher　WWI　was　significantly　correlated　with　an　increased　likelihood　of　trouble　sleeping　(OR　=　1.26,　95%　CI:　1.16,　1.36;　p　＜　0.001)　and　sleep　disorder　(OR　=　1.71,　95%　CI:　1.50,　1.95;　p　＜　0.001)　in　the　overall　population.　RCS　analysis　indicated　a　linear　relationship　between　WWI　and　these　sleep　outcomes.　Subgroup　analysis　identified　that　the　connection　between　WWI　and　trouble　sleeping　was　most　pronounced　among　Non-Hispanic　Blacks　and　individuals　with　lower　educational　levels.　For　sleep　disorder,　the　association　was　stronger　in　males　and　Non-Hispanic　Blacks.　A　slight　negative　association　between　WWI　and　sleep　duration　was　found,　especially　among　non-drinkers　(beta　=　-　0.13,　95%　CI:　-　0.24,　-　0.02;　p　=　0.028).　Conclusion　The　findings　highlight　a　significant　and　linear　relationship　between　elevated　WWI　and　an　increased　likelihood　of　experiencing　trouble　sleeping　and　sleep　disorder,　with　variations　observed　across　different　demographic　and　lifestyle　subgroups.　These　results　imply　that　central　adiposity,　as　measured　by　WWI,　plays　an　important　role　in　sleep　health.