Many people think they slept 7-8 hours, but Sleep Fragmentation Syndrome can reduce actual rest to 4-4.5 hours, with dozens of micro-arousals breaking deep and REM sleep. Dr Nalini Nagalla, Pulmonologist explains that stress, screens, late workouts, sleep apnea, reflux, or environment can trigger this. Proper evaluation and adjustments restore real, restorative sleep.