Neurological conditions like Parkinson's disease and Alzheimer's disease can reduce REM and deep sleep. In our analysis of Empirical Sleep data, sleep apnea was the #1 factor driving reduced sleep quality. Sleep disorders : sleep apnea, narcolepsy, and restless leg syndrome can disrupt the normal sleep cycle and prevent a person from getting enough deep and REM sleep.
Here are the most common factors that lead to insufficient deep or REM sleep: Many factors drive sleep quality, ranging from medical conditions to your daily habits.
