Your body is dehydrated since you can't drink while sleeping. Water in the morning restores fluids lost during the night.
A glass of water first thing in the morning can help avoid this by promoting rehydration, ensuring tissues and organs absorb fluids ASAP.
Even mild dehydration can make you forget things and lose focus, so drink that glass of water if you want to stay on top of your game.
Cold water activates cold-activated thermogenesis. This means your body increases its metabolism by 30% for an hour to reheat the water.
Water aids digestion. Dehydration causes constipation, so staying hydrated can help. Drinking water when you get up help things flowing if you're constipated.
Sipping water first thing in the morning on an empty stomach will help if you don't eat breakfast or are still hungry for junk after eating.
This behavior is healthful, but it doesn't define excellent hydration and health.
To put it another way, it's beneficial to drink water first thing in the morning and before eating, but there's no reason not to wait.
If it makes you feel happy and you personally experience the benefits, that's fantastic!