Use the following pieces of context to answer the question at the end. Please keep the answer short. If you don't know the answer, just say that you don't know, don't try to make up an answer.

QUESTION: Tracking Sleep Through NAME_1 Technology

ANSWER:Millions of people are using smartphone apps, bedside monitors, and wearable items (including bracelets, NAME_1 watches, and headbands) to informally collect and analyze data about their sleep.  NAME_1 technology can record sounds and movement during sleep, journal hours slept, and monitor heart beat and respiration.  Using a companion app, data from some devices can be synced to a smartphone or tablet, or uploaded to a PC.  Other apps and devices make white noise, produce light that stimulates melatonin production, and use gentle vibrations to help us sleep and wake.

QUESTION: How to NAME_2?

ANSWER:A clinical sleep study was once the only way to investigate your sleep in great detail. Now, we have countless easy ways to proactively track and manage our sleep on our own. Especially combined with wearable devices, smartphone apps can analyze biological markers and other sleep data. 

In addition to recording the number of hours you slept, digital sleep tracking tools observe sounds, movements, heart rate, and breathing rates while you sleep. That way, you can find out if you’re sleeping long enough, cycling through NREM and REM normally, or experiencing sleep disturbances you can’t recall once awake.

Equipped with this information, we encourage you to adjust 