The goal of this study is to learn if a smartwatch is effective to identify factors related to sleep quality and habits of adults (30 years old or more), enabling the improvement and/or creation of instruments to assess overall health status and sleep quality.

The main question it aims to answer is:

- Does the smartwatch application (software) indicate sleep habits and measure sleep quality in accordance to the standardized clinical instruments commonly used to assess sleep?

Participants will answer questionnaires about overall health status, sleep quality and insomnia at the beginning, at 16 days follow-up, and at the end of the study. Participants must use the smartwatch for at least a 12-hour period that includes night time, during a minimum of 30 consecutive days.

Inclusion Criteria:

• Adults (30 years old or more);
• Minimum score of 7 on Pittsburgh Sleep Quality Index;
• Capable of giving consent.

Exclusion Criteria:

• Night shift workers;
• Skin condition that may interfere with optic sensor readings - such as Lupus, Atopic Dermatitis, Vitiligo;
• Tattoo on the wrist area that may interfere with optic sensor readings;
• Allergies or sensitivities to the components/materials of the smartwatch;
• Health condition that may be considered risky/unsafe by the medical team;
• Pregnant women.

Any participant that reports sleep problems or insomnia screened by the open survey sent to different groups in the city of Sao Paulo (Brazil).