One type pf personal health monitor measures the amount of time you spend in rem sleep true or false

True.

Explanation:

REM sleep is usually the hardest stage of sleep to reach, but this is where the body can really relax and where the rate of brain renewal is highest. After being in the REM phase, the body returns to phase 1 again and repeats all phases until it returns to the REM phase again. This cycle repeats throughout the night, but the REM sleep time increases with each cycle. It is through a type of personal health monitor that you can measure the amount of time you spend in REM sleep.

the answer is 12 hope it