quedarse dormido bedeutet auf Englisch

doze off▼(fall asleep unintentionally)
verb
[UK: dəʊz ɒf] [US: doʊz ˈɒf]

fall asleep▼(to pass into sleep)
verb
[UK: fɔːl ə.ˈsliːp] [US: ˈfɑːl ə.ˈsliːp]

oversleep [overslept, oversleeping, oversleeps]▼(to sleep for longer than planned)
verb
[UK: ˌəʊv.ə.ˈsliːp] [US: ˌoʊv.ə.ˈsliːp]