Is it normal to act like a kid when going to bed? I'm 19 though!?

Oh gosh, I hope you're not trolling, well just do whatever will make you feel better if you're going to sleep. As for cuddling girls like that, but the mew-ing thing, I'd say most girls might be like what's wrong but, I'm sure if you explained it then it'll be more okay. They'll definitely think you're acting like a little boy, but I know some girls are into that. :D