What kind of sleep disorder is it when a person starts to sound drunk at night when tired?

I am talking about a person who does not drink any alcohol, use any drugs (legal or illegal), and who has been this way most of their life? Also they are definitely a "morning person" but cannot focus well after about 8 pm and then start to sound naturally drunk by bedtime. (I know this is a sleep disorder because I found it once and now can’t remember what it was).
I am not talking about sleep deprivation. I’m talking about regular and normal hours of sleep, such as 10-6 or 11-7 every night.
I think it may be part of "Advanced Sleep Phase Syndrome." Anyone heard of this before? (I have Delayed Sleep Phase Syndrome, the opposite of what I’m talking about here).

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