Inclusion Criteria:  Subjects must currently live in a residence exposed to relevant levels of nocturnal aircraft traffic and have received a recruitment survey in the mail. Only one subject per household will be eligible, selected pseudo-randomly as the person in the household who most recently celebrated a birthday. In order to be eligible to participate in the in-home study, participants must have completed and returned the recruitment postal survey that was sent to their residence.  Exclusion Criteria:  Survey respondents interested in participating in the in-home sleep study are ineligible to participate if they:  are less than 21 years of age; have a Body Mass Index (BMI) greater than 35 kg/m2 or less than 17 kg/m2; have been diagnosed with a sleep disorder, including obstructive or central sleep apnea, narcolepsy, restless legs syndrome, or periodic limb movement syndrome; frequently (3 or more times per week) use prescription or over the counter medication to aid sleep; have a hearing impairment; have a cardiac arrhythmia; work night shifts (defined as working for at least 4 hours between 00:00 to 06:00); have dependents that frequently require care during the night; or are pregnant.