It's a Peter

Peter.rb

class Peter
    def isTired?
        hadClassToday? && Time.now.hour > 22
    end

    def hadClassToday?
        true unless ( Time.now.wday == 0 || Time.now.wday == 6 )
    end

    def status
        if self.isTired?
            "zzz"
        else
            "O_o"
        end
    end
end

> peter = Peter.new
> peter.isTired?
=> true 
> peter.status
=> "zzz"