〔起きられない[起きられる]〕This child always finds it difficult [easy] to get up./This child is a bad [good] riser./〔機嫌が悪い[よい]〕This child always wakes up in a bad [good] humor.
2〔居住〕
彼女と同じ家に寝起きしている
She and I live 「in the same house [under the same roof].
東京では叔母の家に寝起きしていた
I stayed at my aunt's (place [house]) when I was in Tokyo.