I sleep 7.5 hours per night fitbit says i average 3 times restless the rest deep sleep. i feel like i dream alnight & wake exhausted any advice?

Not unusual: The average adult will sleep no longer than 4 hours without alerting & slipping back into deeper sleep. Subsequent alerting periods can occur every 45-90 min or so. Most never remember them because you don't come to full alertness. Many adults need 8+ hrs/night depending n physical or mental activities during the day. A sleep study could sort this out.