Our school pigs get up when the cleaners come in at 6 then realise they aren't getting brekkie so go back to bed. Then get up again when I feed them at 7.30, back to bed til break time then out to look at the kids, repeat at lunchtime, then up at dinner time at 4pm. Oh and they get up whenever anyone goes to sort the chickens out during lesson time. Bit of a snuffle round and a sunbathe as the mood takes them!
I think they go to bed properly at about 7pm, certainly they go to bed before the end of our yr6 open evening and no amount of carrots can get them to come out and show themselves to the prospective students!