Only can sleep 4-5 hours

Hey everyone, started to use cpap 2 weeks ago. It was a battle for 10 days adjusting my mask, now for the past 3 nights my leak has dropped to like 2l a hour, ahi is down to 1. First 2 nights i was able to sleep 8 hours first time in my life, i didnt really feel a difference though. Last night i woke up after 4 hours of sleep. I feel super sleepy and tired today. I asked chatgpt and it said its common to feel sleepy when cpap is kicking off. Anyone experienced this? Also my apnea was the severe severe kind.