You liked sneaking out, it was fun. Did you have a real reason? No... well, if trying to explore the many passageways, finding ways into the restricted section of the library, or going to the astronomy tower were good reasons then you did! Unluckily, they aren't. Filch would skin you alive if he saw you out again.
But you're a Gryffindor! It's in your blood, you're brave and courageous, and all that pizzazz! The portraits were annoying, so loud when you're trying to be quiet, let's not even get started on Peeves...
As you make your way back to the common room you hear the very familiar sound of the portrait of The Fat Lady denying someone entry followed by an annoyed groan from said someone.
"Come on! I'm the boy who lived, you know I'm a Gryffindor!" Ah, it was Harry. Couldn't he be quieter, it's the dead of night, after all.
Still, he needs the password as he gets denied once more. It was a pretty easy password to forget, a lot of m's. 'Mibulus mimbletonia', you could tell him. Or you could let him struggle a bit more.
Either way, you might want to be quick. Who knows when Filch'll appear from around the corner.