If it's yellow then it is concentrated. Loki's is clear. Still, with excessive thirst I would still see the vet. It could be the sugar type of diabetes too. I've learned not to mess with excessive thirst.
I was up 2 hours later than normal last night and my guys were still up at 6:55. I haven't needed to get up that early for work in 2 months but they still wake up then, want breakfast, go out to pee and we all get back in bed and snooze for another hour. They wake up because they are hungry. If I feed them later in the day they sleep longer. But then they want dinner at 3pm. So I might switch them to 3 meals a day... But anyway we are pros at getting up whenever they do, taking them outside, throwing food in their bowls and going back to bed.
Oh, an extra trip out at night helps too. I have to wake them up and practically carry them out, but it give me an extra 20 minutes in the morning