Smartwatch Accuracy for Measuring Vitals and Anxiety Before Disc Surgery

This study is testing whether a consumer smartwatch can accurately measure vital signs (like heart rate and breathing) and detect anxiety levels the night before spine surgery for a disc herniation (a slipped disc in the back). It is a non-treatment study — researchers are simply checking the smartwatch's accuracy. **You may be eligible if...** - You are 22 years old or older - You are scheduled to have surgery for a herniated disc - You are willing to wear a smartwatch for at least 8 hours the night before your surgery - You have no major cardiovascular problems (controlled high blood pressure is okay) - You have no nickel allergy **You may NOT be eligible if...** - You are currently taking prescription sleep medication - You are unwilling to participate - You fail to wear the smartwatch correctly, leading to incomplete data Talk to your doctor to see if this trial is right for you.