Thanks for the reply.
If out her cage, Luna is active, but as soon as i put her back in her cage - even just after 5-10 mins she is worn out and goes back to bed. She's been like that for a while, she used to be out for 30 mins minimum before, but more like an hour. even in her cage when she is up above ground she seems her normal self, she's only doing it for 15 mins max though and then she doesn't come out for hours, the other night she didn't come out again at all.
She's not hunched and as far as i can tell not in pain, just very tired.
Luna is not one for sitting still
She's very much a wriggle bottom and likes to burrow around, even if it's me she's trying to burrow through, nudging me with her little nose.