Embr Thermal Device for Hot Flash Management in Prostate Cancer

Inclusion Criteria: * Have received a diagnosis of prostate cancer and have received treatment with GnRH agonist or antagonist therapy or orchiectomy at least 1 month prior to enrollment. * May have received prior definitive radiation therapy or surgery (\>60 days prior to study). * Have bothersome hot flashes (occurrence ≥ 28 times per week and at least moderately bothersome). * Presence of hot flashes for \>30 days prior to study entry. * Have a working smartphone (iPhone 6 or greater; or Android 8.0 or greater). * Willing to downloading and use the Embr thermal device companion app on their phone * Willing to wear the Embr thermal device for 4 weeks, and charge and sync the device daily * In order to complete the mandatory patient-completed measures, participants must be able to speak and/or read English Exclusion Criteria: * Planned treatment with chemotherapy and/or any medical intervention that will impact hot flashes, sleep, or other daily activities of daily life during the 4-week study. * History of a known sleep disorder, other than insomnia (eg, obstructive sleep apnea, restless leg syndrome), or medical or psychiatric condition that affects sleep, or undergoing treatment for insomnia. * History of cognitive impairment or dysfunction. * Seizure history, history of recurrent falls, or known brain metastases. * Uncontrolled intercurrent illness. * Individuals with a second malignancy other than non-melanoma skin cancers. * Individuals taking psychotropic medications or illicit drugs that may alter cognition, concentration, or behavior. * Individuals taking prescription sleep medications. * Individuals who report consuming more than 7 alcoholic beverages/week and/or frequent alcohol consumption within 2 hours prior to bed.