Help my little girl sleep.

Our little girl is falling asleep badly, we plan to try a humidifier for her. The air in our city is dry and maybe it prevents her from breathing freely. This is our second child, but there have never been such problems. We want to sleep ourselves, already in despair. The doctors say she is completely healthy. We were advised to look at these models of humidifiers. You can tell us something about them. Forgive me if I don't sleep well, my mind is as foggy as it is. Just help me with advice or give the model a hint. We were advised to look at these models of humidifiers. You can tell us something about them. Forgive me if I don't sleep well, my mind is as foggy as it is. Just help me with advice or give the model a hint.