After buying and returning 2 other humidifiers I have finally found exactly what I wanted.
This is an excellent warm mist humidifier. The tank holds a lot of water and lasts all night.
It has a button to turn off the lights so as not to interrupt sleep.
The dry air has caused me to wake up with a sinus headache every morning.
I've now had this for a month and use it every night next to my bed, I have not had one headache.
Don't hesitate, I've done the research and bought the junky ones. This one is worth the money!