The strongest psychological predictor of persistent pain after surgery is anxiety before surgery. The weight of blanket a person uses overnight may alter both anxiety and pain levels. The proposed study will determine whether a heavier or lighter blanket alters presurgical anxiety or postsurgical pain in individuals undergoing a breast surgery. We will also study whether any blanket-induced changes in postsurgical pain are related to reductions in anxiety before surgery induced by the blanket. Finally, we will examine clinical and psychological factors that might explain differences in how surgical patients respond to blanket weight. This research will improve our understanding of whether blanket weight can alter anxiety before a surgery or pain after a surgery.

Inclusion Criteria:

• Fluent in English
• Undergoing breast surgery
• Willing to sleep with a weighted blanket for up to 3 months
• BMI of at least 18.5 and able to safely lift up to 15lb
• Willing and able to use their personal smartphone for the ecological momentary assessment app to submit ratings using personal data plan

Exclusion Criteria:

• Pregnancy
• Chronic high-dose opioid use
• Current or previous use of a weighted blanket
• Claustrophobia
• Incarceration

Partial masking: Although blanket heaviness will be perceived, blanket weights tested in the study will not be disclosed to participants. Wait-list control group will know they are not receiving active intervention.