Ask your guide: where do the elephants sleep at night?
Elephants naturally only sleep for up to four hours a day; the rest of their time is spent foraging or roaming.
If an elephant is allowed to spend the night in a forest, they will have access to their natural environment, choosing when to rest and when to forage or socialise.
The reality for any captive elephant - whether they are a working elephant or in a sanctuary - is that they must be kept secure at night (for their and humans' safety). This often means being chained up. Some camps will chain the eles tightly in a concrete stable, whereas more ethical venues will allow them to be chained loosely in the forest.
Some sanctuaries are trying to reintroduce their eles to the forest at night through exciting projects involving bees!