Depending on the size of your apartment and the amount of air exchange, running it for 20 min before you go to bed may be perfectly sufficient until morning. B

Depending on the size of your apartment and the amount of air exchange, running it for 20 min before you go to bed may be perfectly sufficient until morning. But yeah, I see the point. Just wanted to point out this alternative - when it comes to humidifying through boiling, it's a matter of dumping energy into water, and your stove is excellent at doing that quickly. With a regular humidifier, you may need to wait hours until you get the humidity where you want to have it, a stove can be much faster.