A particular product I swear by is the Sleep Cycle app. It is an alarm clock that uses the accelerometers and microphone in your phone to monitor your sleep (by function of breathing patterns and movement). It tracks activity to determine how an individual is progressing through the stages of sleep. By monitoring the sleep patterns, it provides insight to individuals sleep habits and also provides a system for allowing an individual to wake from sleep during the lightest stage, helping to limit grogginess and fatigue upon waking.
According to the FDA, this product would be considered category 1. Its intended use is to promote general wellbeing and does not specify a specific condition that it is attempting to improve.

https://www.sleepcycle.com