I started getting really into plants this spring and have already ended up with a couple dozen in my house. They have all been doing really well until just a couple weeks ago. Now multiple plants have started drooping and losing leaves. Once the weather started changing and we had to kick the heat on, I've been trying to make sure we have humidifiers on once in a while to keep the air from getting too dry. I also bought some grow lights since the days are shorter and it's been cloudy so often. Is there something more I should be doing? Is this a normal reaction for plants to have once it starts getting cold out? I'm really worried I'm going to end up with a house full of dead plants.