I think like this:
Go to bed : action of going to one's own room and lying down on the bed.
Go to sleep : I'm already in my room and lying down on my bed. And at some point I fall asleep.
Sleep : in the state of being in dream. this is not a point but duration.
With this, I made a story.
I usually go to bed around 10 but go to sleep(fall asleep) about an hour later. And I sleep for about 8 hours.
Am I right to think this way?