This study is about testing new devices to measure sleep and wake states. Instead of using traditional wires and electrodes, which can be uncomfortable and expensive, the study uses special ear buds and glasses to gather information. These devices may make it easier and more comfortable to assess sleep states.

• Study Length: Participants will stay overnight in a sleep lab and take tests the next day.
• Participation Requirements: Healthy adults aged 18-60 who live within 20 miles of Emory Sleep Center.
• Compensation and Risks: Participants will undergo tests with minimal risks and contribute to potentially easier sleep monitoring methods.

Participants will wear standard electrodes and the new ear buds at the same time to compare results. They will have to stay awake four hours past their usual bedtime, allowing only 3-4 hours of sleep. The next day, they will have to stay alert during tests and complete tasks to assess their attention and memory. Volunteers will also read aloud, and their voices will be recorded for study purposes. Participants will wear special glasses during these tasks.