I take four hour naps?

I come home from school, really exhausted & tired, & my body takes over when i am in bed, & sooner or later i dift off to sleep, i will wake up four hours later from my nap, i heard naps are really beneficial but i doubt a four hour nap is... Do i take really long naps because my body is just so exhausted? Note: I don't really take naps, but for the past three days i took a nap,
I take four hour naps?
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