I'm trying to figure out why I'm sometimes quite thirsty in the middle of the night after a big ride.

Let's say I go on a 60 mile ride and don't drink as much water as I should have.

If I get home and drink, say, a quart or more of water, does that take care of the deficit, or can my body not absorb the water fast enough? Do I have to space out my rehydration?