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Age is a factor. As you age, you might require less sleep. Your 9 to 10 hours of sleep is on the high end of the required sleep for people. Few people need this much. If you are getting into your twenties now, this might explain why you're sleeping less. Teenagers typically need more sleep than other adults.
Most adults only need 7 or 8 hours of sleep.... some need more, some need less.
But none of this would explain a sudden change. Maybe you've been sleeping too much and it's caught up to you. Maybe there's an underlying problem related to your long-term sleeping habits.
So, yes, go speak with your doctor.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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