DD has a sleep sheep that she turns on before she goes to bed. She likes the rain and the waves sound but it shuts off after 45 minutes. She doesn't NEED it to go to sleep but it's just been a part if her bed time routine. She can fall asleep fine without it and never uses it for naps. Now that baby 2 is arriving I wonder if I should invest in a better sound machine. The new baby will be in my room in the beginning. Do you think a sound machine is necessary with 2 kids? At what age did your LO stop using a sound machine? Do you play it all night?