Yep, they both have lights. The washer light is very handy because the inside is stainless steel and can be dark. Occasionally a dark colored sock gets left behind if we don't look carefully. The dryer is white inside, so it's less of an issue.

I once left the door open as a reminder to get the clothes out and then went to bed (some reminder, huh?!). It was easily 30 minutes later and I was having a hard time sleeping because of the odd light coming from the hallway. It was the washer light on! I'm pretty sure ours don't go off after a certain time.

I guess if I felt the need to leave the door open, I'd unscrew the bulb. In over 5 years (including 4.5 of them in super humid Florida & NC) we've never had a mold issue, I'm certainly not going to start worrying about it now!