What was the weather like? My Artie is about four and he's spent nearly all day curled up in his pet bed. With him it tends to be -
nice weather = playful/sunbathe
dull and cold = stay in bed all day.
I suppose they do slow down as they get older?? I've often wondered how much to expect they to 'play' as they get older, as well as the sleeping stuff. I know my bunnies are particularly lively at 5.00 am at this time of year, perhaps they get it out of their system then!!