From Malay tidur, from Proto-Malayic *tidur (compare Malay tidur), from Proto-Malayo-Polynesian *tiduʀ, *tuduʀ (compare Javanese turu, Tagalog tulog), from Proto-Austronesian *tuduʀ.
1) to sleep (to rest in state of reduced consciousness)
1) sleep (state of reduced consciousness)
I believe it's probably because they didn't program the app do accept wrong Emglish grammar. "Yes, we were sleeping" should be accepted though, as in indonesian there's no verbe tense. So "we sleep", "we are sleeping" and "we were sleeping" are equivalent in Indonesian if context is not provided.