Why do I only sleep for 6 hours?

Your_boss960
My alarm clock was supposed to go off at 5 am but I woke up at 4 am. I've only slept for 6 hours. Why am I naturally waking up after 5-6 hours of sleep? I've been only sleeping for 3-5 hours the whole month. I'm still tired. Do I have a problem?

Im scared of having holes in my brain because of this.
Why do I only sleep for 6 hours?
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