That depends on when I feel asleep. If I go to sleep early, I would say 8 hours, but if I sleep late, then most likely 6-7 will be just fine. It also depends on my dreams because I always dream. Every single day. I read that dreams often occur at 1am because the brain goes in REM phase of sleeping. Sometimes the issue is when I dream and keep waking up around 2am, 5am, or 6am. It interrupts my sleep and I wake up very tired despite going to bad earlier.