Goats are a bit like horses, they don't actually sleep a lot. But obviously they do need to rest and lie down.
Because we milk ours, we bring the females in before milking in the evening, and keep them in overnight, milk the next morning and put them back out. So generally its in by 7pm at the latest, and out again by 8 at the earliest. But ours are pampered and don't go out all year round as we like to rest the field for 6-8 weeks, and we keep them in when the weather is bad. They go out from April - October pretty regularly, and less frequently from October back to April.
Beth