15 month old wakes up for milk still...

Nic
Hey ladies! My son is 15 months. He goes to bed around 8 pm and will wake up anywhere from 5-6:30 am. When he wakes up I usually give him milk and he goes right back to sleep until 8. Does anyone else do this? Is it normal?? I know when I wake up in the morning I like to have a big glass of water bc I'm thirsty. Thanks :)