Staying steady in the late evening and overnight hours is often the result of lifestyle changes; increased physical activity, improved nutrition choices, and healthy habits to lessen stress and promote restful sleep. Significantly low nighttime glucose can be a result of a myriad of factors; a glucose spike and then reactive crash, inadequate food the day prior, or drinking alcohol just prior to bedtime. Occasionally, nighttime lows occur as a response to physics, not habits.
If you sleep on your biosensor, this physical pressure can affect your biosensor’s ability to gather data and continued compression can result in falsely low values that can persist for hours. Try adjusting your sleeping position to avoid sleeping on the biosensor.