They do not sleep overnight in the aviary - no way I'd ever take a chance like that. As it is, when they are out during the day our dogs are present to fend off anything that would dare come near, including hawks.
When sunset is approaching they get very flighty and fighty in the aviary. They DO NOT like being out there as dark approaches. So we bring them in and have some hang time until bedtime.
Once they do establish a bedtime and I know what it is, I do try to adhere to it whether they like it or not. Keeping them on a schedule is easier than letting them set ALL the ground rules - haaahaaa.