The vibration intensity can be adjusted... The vibration creates good movement in the cradle... The major downside is that after 20-25 minutes its efficiency starts to drop (it doesn't vibrate enough), and it heats up... you need to stop it, let it cool down for about 10 minutes, and then use it again... so if you want it to run all night without supervision, I don't recommend it because the device could burn out... Usage tip: use it for 20 minutes, and if the baby falls asleep, stop the device so it doesn't break (unless I got a defective one, because it says 3.5 hours of use)... or choose something else because it's not that user-friendly... Now, whether it helps the baby fall asleep is purely subjective... every baby is different... ours (1 month old), who has a hard time sleeping in the cradle unless you rock him until he completely falls asleep, we saw a small difference with the device... (always without sounds) dehumidifier, TV white noise, vacuum, washing machine will never be replaced...