With spring/summer allergies I get really tired. I wish I could sleep an extra REM period. But I get 7 hours each night. The theory that it is best to wake up

With spring/summer allergies I get really tired. I wish I could sleep an extra REM period. But I get 7 hours each night. The theory that it is best to wake up during soft-sleeping between REM sleep interests me. As others have mentioned, sleeping too much can make you sleepy all day as well. Anyone got one of those alarm clocks that wake you up when you sleep softly between REMs?