I have two and one sleeps in the kitchen and one on my bed. Bed Cat wanted out at 6am this morning. However I did manage to go back to bed - Kitchen Cat was still in his bed when I went back down at 8.30
We have two cats, one is a howler when she wants food/cuddles/out/her own poop scooped out the tray. This can be anywhere between 2-5am. If we don't respond, she hooks her paws under the door and rattles it in the frame until we HAVE to get up. She has been known to open the door and sneak upstairs to make sure that we hear her
She's 14 now, so we just sigh and deal with it....she's in her twilight years and I guess she gets what she wants now.
My other cat (13 so hardly a spring chicken) just looks at us, sighs, and puts her tail over her ears to block out the din.