electrodes are typically attached to your scalp close to the top (central), back (occipital) and frontal areas of your brain. These channels are used to identify if you are awake, asleep, and the different stages of sleep your progress through.

What do they attach to you for a sleep study?

First, a sensor is attached with tape to your upper lip to measure airflow. Second, lightweight belts are placed around the chest and abdomen to measure how much effort you are making to breathe. These belts are not tight or restrictive; they are sensitive to the motion of breathing.

How many hours of deep sleep do you need?

The amount of deep sleep that a person has will relate to how much overall sleep they get. Sleeping 7 to 9 hours is the recommendation for most adults, which will usually give the body plenty of time in the deeper states of sleep.

How many hours of deep sleep do you need per night?

Scientists agree that sleep is essential to health, and while stages 1 to 4 and REM sleep are all important, deep sleep is the most essential of all for feeling rested and staying healthy. The average healthy adult gets roughly 1 to 2 hours of deep sleep per 8 hours of nightly sleep.

How accurate is Fitbit sleep?

Sleep-staging Fitbit models showed higher sensitivity (0.95-0.96) and specificity (0.58-0.69) values in detecting sleep epochs than nonsleep-staging models and those reported in the literature for regular wrist actigraphy.