I'm having a hard time keeping the humidity up at night. During the day, if it gets to 40% not a big deal, I can spray some water on the glass, boom back up. At night is the issue. I go to bed, he's normal around 60%. I get up, he's down to 30% but it seems to stay regulatory at 30%, no lower. But that's still too low, so how do you guys regulate humidity at night?